Print it and throw the dice. Swap a new color filamant as soon as the floor is done. I added a modified version of the dice from there: https://makezine.com/article/digital-fabrication/3d-printing-workshop/design-your-own-dice-in-openscad/

The print was done with white PLA for the floor with Protopasta “Original Nebula Multicolor HTPLA”.

The dragon skull stl uses a low poly version of https://www.thingiverse.com/thing:4129930