Just want to share some experience I made today in Valve Hammer.
A big thumbs for this
tutorial! Thanks to that, I was able to make a forest hill terrain.
This is the final result I made so far
Therefore, here is a little Holiday gift from me. Also incuded the schitt brush-made car I made. Enjoy.

You can change its texture whatever you like, or mess something with its brush. You'll learn something from it or you can try making one yourself with the links above.