Last week I went into my local art supply store, and I came out with a bag full of Posca art markers. They were on sale, but I probably dropped close to 40 bucks. I've never used these particular pens before. They’re paint markers and seem to work like acrylic or gouache because they're opaque. I know a certain amount about using opaque materials but I don't really know how people use these pens or what I'm gonna do with them either. I buy a lot of art supplies like this — on impulse. Ideas...