I'm in a landscape painting class this semester. Our focus has been the Erie Canal, not the most inspiring of subjects, but we do get off campus for a couple of hours every week so you wont hear me complaining.
This is gouache on brown paper. It's about, meh, 5x5 inches? I've only started working this way this semester, and I like it. It's quick and if I mess up it doesn't take me long to do another. I've learned a lot working this way, I'm really pleased with my progress and results.