This seems like a fun way to create new creatures. Take existing skeletons and just try to plop on flesh in unique ways.

This was already done in "All Todays," which features depictions of modern animals as distant-future paleontologists might reconstruct them, given just skeletal remains.

Example of Elephant, Zebra, and Rhino:

'All Todays' Explained - https://obscuredinosaurfacts.com/blog/post/2020/09/16/all-todays.html