Here is a four color print that is mostly one color and never uses more than two colors at a time. This is a simple task for the MMU but also can be accomplished with a dual-extruder and a just a couple of filament changes.
This is a replacement for the Head and Jaws for the Minecraft Ender Dragon model on Thingiverse.
There are four STLs for the Head:
-Head (Typically Black)
-Eyes (Red)
-Ears (Silver)
-Nostrils (Yellow)
There are two STLs for the BottomJaw:
-BottomJaw (Black)
-Tongue (Red)
The rest of the dragon could be printed using MMU Single with a ColorPrint marker for changing the filament. NOTE: On the current MMU2S firmware you must change the filament. There is a Push in place with a fix but Single MMU handles M600 as if it only has one extruder.
The author hasn't provided the model origin yet.