I've been thinking about making a beginner's tutorial to help new people make stuff easily that looks kool. Maybe when I get the map I am working on finished up, I will work on a tutorial and a prefab pack or something.
I've got a few tricks making rocks and stretching them etc. I think would be beneficial. Plus, little things to make a room not look blocky etc and some, not so perfect, ideas to help people understand hint brushes a little better and use them in their maps (and not some complicated hint brush tutorial that takes a lot of technical know-how to understand).