I'm starting to try to work with sharpies in my art. Usually, I don't use them to get the finished piece but I do a good portion of my work in them. Most recently, I did some outlines of fish and then added in details with sharpies. I like the sharpies, because they're permanent. Too often, I try to redo things. The sharpies force me to accept what the art looks like or scrap it. And I like that. I like seeing what my instincts produce, rather than my doubts.