Just click somewhere off the lines. This is kind of as simple as fill engines can get.
Be patient; it could take a while to fill all of the nooks and crannies. All idea, code and art (sort of) by me. The sort of about the art: I just traced some random image on google for the tabby and angler slimes. So the tracing is by me but the original source is not. Pros: -It fills things. -It's all pen. (No stamping.) -Very small amounts of code. Cons: -The outlines have to be something like 10pt or more. -It can't fill tight spaces. -You have to wait a while to fill some things, which requires user input. -It uses the pick random block, so it's not consistent. -I could go on forever with this list.