Any good concepts without difficult models?

Hello everyone,

I'm still learning unity and I'm just asking for some concepts to work on without using any models I have to buy. Or maybe some good free models or a place where I can find free models.

Would be great for practice :)

Here are some free models (and some paid ones aswell) Pretty good site actually.

TurboSquid

the3dstudio.com and http://sketchup.google.com/3dwarehouse