water and other natural scenes are good for testing out a new 3D system
Miscellaneous 3D
Here's a few random 3D images I made while learning some new techniques - several of these are from a few years ago when I was experimenting with Blender (I normally use Maya or 3DS Max) I was following some excellent tutorials online from the BlenderGuru. Believable nature scenes in 3D are challenging but fun.