Whenever I have a spare moment I like to try and doodle in zbrush. I think back to when I was modelling, pulling points, using clusters, etc, and I am just blown away by far the technology has come in 10 years. Mainly these are just a way for me to learn the tools and get faster at the program. Even with my noob-knowledge I find using the dyamesh system very fast and intuitive. These are some examples of sketches done over lunches. Nothing fancy, just having fun. However, I am starting to see the possibilities in doing quick 3D concepts to test out 2D ideas.

Damn Straight!
It really does seem possible to get an idea out quicker in 3d than 2d sometimes these days. Bravo!
Amazing concept work! great job!!
Looking good like the right bottom the most,
yes I think so to that 3D modeling is a nice way to sketch