So after going back and forth a bit, I've started working on a major dungeon crawl. I started my first map, and have since sorta sat down and planned out the whole thing, although I've added a few extra parts here and there. The basic gist came from the first map, which was actually a test for crosshatching in gimp. On paper I drew out where the maps all lead, so for example from the original caverns map, there are 3 exits, 1 of which winds it way to a dragon, one goes to a dwarfen settlement, and eventually some dark elves, and the last exist ends up at a old forgotten temple.
As i was drawing it out, lots of things came to me, little ideas and tibbits. The premise of the whole dungeon crawl is a Wizard looking for ingredients for potions.