Found this while browsing #3Dprinting on Mastodon. This person used Hue Forge to slice up some floor tiles and add some color. Amazing print and good use of the app.
(hue forge is an app that helps you plan filament swaps to progressively add color, kinda like screen printing but for filament printing)
Watch some videos on hueforge. The layers are different colors so you can pause and manually change filament for each color.