diff --git a/internal/handlers/cv_helpers.go b/internal/handlers/cv_helpers.go
index 6c14923..0942cb4 100644
--- a/internal/handlers/cv_helpers.go
+++ b/internal/handlers/cv_helpers.go
@@ -352,6 +352,19 @@ func (h *CVHandler) prepareTemplateData(lang string) (map[string]interface{}, er
 		}
 	}
 
+	// Scan background photos (dev only)
+	var bgPhotos []string
+	if !isProduction {
+		bgDir := filepath.Join(c.DirStatic, "images", "backgrounds")
+		entries, _ := os.ReadDir(bgDir)
+		for _, e := range entries {
+			name := e.Name()
+			if !e.IsDir() && (strings.HasSuffix(name, ".jpg") || strings.HasSuffix(name, ".png") || strings.HasSuffix(name, ".webp")) {
+				bgPhotos = append(bgPhotos, "/static/images/backgrounds/"+name)
+			}
+		}
+	}
+
 	// Prepare template data
 	data := map[string]interface{}{
 		"CV":                &cv,
@@ -366,6 +379,7 @@ func (h *CVHandler) prepareTemplateData(lang string) (map[string]interface{}, er
 		"AlternateEN":       "https://juan.andres.morenorub.io/?lang=en",
 		"AlternateES":       "https://juan.andres.morenorub.io/?lang=es",
 		"ChatEnabled":       h.chatEnabled,
+		"BgPhotos":          bgPhotos,
 	}
 
 	return data, nil
diff --git a/static/css/01-foundation/_reset.css b/static/css/01-foundation/_reset.css
index 3fc9950..2aeb1fb 100644
--- a/static/css/01-foundation/_reset.css
+++ b/static/css/01-foundation/_reset.css
@@ -12,23 +12,25 @@
 /* Body base */
 body {
   background-color: var(--page-bg, #d6d6d6);
-
-  /* OLD PATTERN - Keep for reference (can be restored anytime) */
-  /* background-image:
-    linear-gradient(90deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
-    linear-gradient(180deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
-    linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px),
-    linear-gradient(180deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
-  background-size: 50px 50px, 50px 50px, 10px 10px, 10px 10px; */
-
-  /* NEW TEST PATTERNS - Theme-specific (woven fabric for light, diagonal grid for dark) */
   background-image: var(--page-bg-pattern, none);
-  background-size: 40px 40px; /* For dark theme diagonal grid */
+  background-size: 40px 40px;
   background-attachment: fixed;
   max-width: 100vw; /* Prevent horizontal overflow */
   overflow-x: clip; /* Clip prevents horizontal scroll WITHOUT breaking position: sticky */
 }
 
+/* Background photo layer — activated via JS in dev mode */
+body.bg-photo {
+  background-image:
+    var(--page-bg-pattern, none),
+    linear-gradient(var(--page-bg-tint, rgba(214,214,214,0.85)), var(--page-bg-tint, rgba(214,214,214,0.85))),
+    var(--bg-photo-url, none);
+  background-size: auto, auto, cover;
+  background-position: 0 0, 0 0, center;
+  background-repeat: repeat, repeat, no-repeat;
+  background-attachment: fixed;
+}
+
 /* Smooth scrolling */
 html {
   scroll-behavior: smooth;
diff --git a/static/css/01-foundation/_themes.css b/static/css/01-foundation/_themes.css
index 4de8814..fc9ddc1 100644
--- a/static/css/01-foundation/_themes.css
+++ b/static/css/01-foundation/_themes.css
@@ -62,6 +62,9 @@
   /* Sidebar (for non-clean theme) */
   --sidebar-bg: #d1d4d2;
 
+  /* Background photo tint — controls how much of the photo shows through */
+  --page-bg-tint: rgba(214, 214, 214, 0.85);
+
   /* Legacy CV content variables - theme-aware overrides */
   --text-dark: #1a1a1a;  /* Dark text for light background */
   --text-gray: #333333;  /* Secondary text for light background */
@@ -116,6 +119,9 @@
   /* Sidebar (for non-clean theme) - darker than light theme but lighter than main content */
   --sidebar-bg: #3a3d3e;
 
+  /* Background photo tint — darker overlay for dark theme */
+  --page-bg-tint: rgba(58, 58, 58, 0.85);
+
   /* Legacy CV content variables - theme-aware overrides */
   --text-dark: #e0e0e0;  /* Light text for dark background */
   --text-gray: #d0d0d0;  /* Secondary text for dark background */
@@ -171,6 +177,9 @@
     /* Sidebar (for non-clean theme) - matches explicit dark theme */
     --sidebar-bg: #3a3d3e;
 
+    /* Background photo tint — darker overlay for dark theme */
+    --page-bg-tint: rgba(58, 58, 58, 0.85);
+
     /* Legacy CV content variables - theme-aware overrides */
     --text-dark: #e0e0e0;  /* Light text for dark background */
     --text-gray: #d0d0d0;  /* Secondary text for dark background */
diff --git a/static/css/04-interactive/_buttons.css b/static/css/04-interactive/_buttons.css
index ba3ec12..8cd0d1e 100644
--- a/static/css/04-interactive/_buttons.css
+++ b/static/css/04-interactive/_buttons.css
@@ -124,6 +124,39 @@
     color: #27ae60; /* Green icon when at bottom */
 }
 
+/* Background Photo Toggle (Dev Only - above download button) */
+.bg-photo-btn {
+    position: fixed;
+    bottom: 30rem;
+    left: 2rem;
+    width: 50px;
+    height: 50px;
+    background: var(--black-bar, #2b2b2b);
+    color: white;
+    border: none;
+    border-radius: 50%;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+    transition: all 0.3s ease;
+    z-index: 999;
+    opacity: 0.6;
+}
+
+.bg-photo-btn:hover {
+    opacity: 1;
+    transform: translateY(-3px);
+    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
+    background: #8e6b3e !important; /* Earthy brown — Lanzarote vibes */
+}
+
+.bg-photo-btn.at-bottom {
+    opacity: 1;
+    background: #8e6b3e !important;
+}
+
 /* Download Button (TOP POSITION - now first button after cmd-k removed) */
 .download-btn {
     position: fixed;
diff --git a/static/images/backgrounds/1.jpg b/static/images/backgrounds/1.jpg
new file mode 100644
index 0000000..228d730
Binary files /dev/null and b/static/images/backgrounds/1.jpg differ
diff --git a/static/images/backgrounds/2.jpg b/static/images/backgrounds/2.jpg
new file mode 100644
index 0000000..98f50e2
Binary files /dev/null and b/static/images/backgrounds/2.jpg differ
diff --git a/static/images/backgrounds/3.jpg b/static/images/backgrounds/3.jpg
new file mode 100644
index 0000000..abc4c41
Binary files /dev/null and b/static/images/backgrounds/3.jpg differ
diff --git a/templates/index.html b/templates/index.html
index 748463b..02dfd78 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -50,6 +50,7 @@
     {{template "contact-button" .}}
     {{template "zoom-toggle-button" .}}
     {{template "shortcuts-button" .}}
+    {{template "bg-photo-toggle" .}}
 
     <!-- ============================================ -->
     <!-- MODALS                                      -->
diff --git a/templates/partials/widgets/bg-photo-toggle.html b/templates/partials/widgets/bg-photo-toggle.html
new file mode 100644
index 0000000..a29a61e
--- /dev/null
+++ b/templates/partials/widgets/bg-photo-toggle.html
@@ -0,0 +1,52 @@
+{{define "bg-photo-toggle"}}
+{{if not .IsProduction}}
+<!-- Background Photo Toggle (Dev Only) -->
+<button
+    id="bg-photo-toggle"
+    class="fixed-btn bg-photo-btn no-print has-tooltip"
+    aria-label="Toggle background photo"
+    data-tooltip="Toggle background photo"
+    onclick="toggleBgPhoto()">
+    <iconify-icon icon="mdi:image-outline" width="24" height="24"></iconify-icon>
+</button>
+<script>
+(function() {
+  var photos = [{{range $i, $p := .BgPhotos}}{{if $i}},{{end}}'{{$p}}'{{end}}];
+  var key = 'bg-photo-enabled';
+  var keyIdx = 'bg-photo-index';
+
+  function pickPhoto() {
+    var idx = Math.floor(Math.random() * photos.length);
+    localStorage.setItem(keyIdx, idx);
+    return photos[idx];
+  }
+
+  function applyPhoto(enabled) {
+    var btn = document.getElementById('bg-photo-toggle');
+    var icon = btn ? btn.querySelector('iconify-icon') : null;
+    if (enabled) {
+      var idx = parseInt(localStorage.getItem(keyIdx), 10);
+      var url = (isNaN(idx) || idx >= photos.length) ? pickPhoto() : photos[idx];
+      document.body.style.setProperty('--bg-photo-url', 'url("' + url + '")');
+      document.body.classList.add('bg-photo');
+      if (icon) icon.setAttribute('icon', 'mdi:image');
+    } else {
+      document.body.classList.remove('bg-photo');
+      if (icon) icon.setAttribute('icon', 'mdi:image-outline');
+    }
+  }
+
+  // Init: pick a random photo each load, restore toggle state
+  pickPhoto();
+  var enabled = localStorage.getItem(key) !== 'false'; // default on
+  applyPhoto(enabled);
+
+  window.toggleBgPhoto = function() {
+    var isOn = document.body.classList.contains('bg-photo');
+    localStorage.setItem(key, !isOn);
+    applyPhoto(!isOn);
+  };
+})();
+</script>
+{{end}}
+{{end}}