Generated using HueForge software!

You can play around with different colors and swap heights to customize the look, but I went with the following with each model:

Roses Background
Layers 1-12 = Black (Bambu Labs PLA)
Layers 13-19 = Red (eSUN PLA+ Red)
Layers 20+ = White (eSUN PLA+ Cool White)

Skull
Layers 1-3 = Black (Bambu Labs PLA)
Layers 4-9 = Blue (Bambu Labs PLA)
Layers 10-13 = Gray/Silver (eSUN PLA+ Silver)
Layers 14+ = White (eSUN PLA+ Cool White)

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm for both models.

I glued the skull to the top of the background roses.

Instructions for Bambu Studio and PrusaSlicer layer swaps.

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm