I have printed this in multiple material types and would love to see others do the same. ABS and ninjaflex work very well together but other combos I'm sure would also work.

If you have a prusa with multi material upgrade I'd love to see you print with with E1: bone in white E2: muscles in red E3: support with PVA or other dissolvable support type E4: option to put the skin on top but then you cant see any of the inside, so I'd say do a clear material if you are going to do one.