I'm doing experimental sketches using a recycled brown paper sketchpad and using white, sanguine and sepia pencils. I also used a red col-erase sketch pencil. Practicing more figure perspective and more dynamic angles--for two rather obvious reasons. Oh and lighting. I think my lighting needs work, too.
I'm gonna make more sketches on this paper too, it's really fun and challenging to use a midtone base with three or four colors instead of white and black, or digital color. I've found that doing color pictures while limiting what colors to use to be a good exercise in the creative process. It gives you a better understanding of how to make colors and lighting work. Did I mention how much I've come to love to use ebony pencils, too? They're as smooth as butter.