diff --git a/test-projects/fragments/cartridge/program.pbx b/test-projects/fragments/cartridge/program.pbx
index 6be3f382..94fd28b8 100644
Binary files a/test-projects/fragments/cartridge/program.pbx and b/test-projects/fragments/cartridge/program.pbx differ
diff --git a/test-projects/fragments/src/main.pbs b/test-projects/fragments/src/main.pbs
index c325a22e..d81851a6 100644
--- a/test-projects/fragments/src/main.pbs
+++ b/test-projects/fragments/src/main.pbs
@@ -20,7 +20,16 @@ fn frame() -> void
         let gy = y / CELL;
         for x: int from 0 until SCREEN_W step CELL {
             let gx = x / CELL;
-            let color_raw = (gx * 257 + gy * 911 + ticks * 149) % 65535;
+            let wave_a = (gx * 211 + ticks * 9) % 31;
+            let wave_b = (gy * 173 + ticks * 7) % 63;
+            let wave_c = ((gx + gy) * 149 + ticks * 11) % 31;
+            let wave_d = ((gx * gy) + ticks * 5) % 63;
+
+            let r = (wave_a + wave_c) % 31;
+            let g = (wave_b + wave_d) % 63;
+            let b = ((wave_a + wave_b + wave_c) / 3) % 31;
+
+            let color_raw = r * 2048 + g * 32 + b;
             Gfx.fill_rect(x, y, CELL, CELL, new Color(color_raw));
         }
     }