Personal creativity, that's art. People might not say it is, but you can't argue about taste.
On the topic of free programs. Wings3D is a good one. (At least I got it free.)
It is powerful enough for the simple things, though its performance is ultimately decided by your hardware. Best of all, it is very easy with everything a right mouse button click away.
I've also got Blender, but I can't wrap my mind around it. Just moving the camera is hell for me.
