I absolutely love when people design things for 3d printing that are somewhat open-ended. By that I mean that the final product or result is somewhat up to the person doing it. Kits are a perfect example and this art project is another delightul example.
JoshkenYT has put together this set that allows you to print pixels in whatever color you want. These then click onto a base that allows for you to make and preserve great pieces of pixel art.