Looking for interesting 3D shapes to test with

Can anyone recommend a good source of 3D shapes that can be imported into Kiri Moto and sliced for use on a laser cutter?
I just found the app and thought it might be fun to test on a human head model or something like that.
Please bear in mind I am a novice with 3D but have a bit of knowledge with Lightburn and a diode laser cutter.

LuBan3d is an awesome suite of tools, one of which is a module for slicing 3d objects for laser cutting