I'm working on educating myself with the basics. To more directly answer the question, most recently I've been playing around with learning to make maps: towns, castles, interiors, exteriors, world map and island design. I'm not blindly playing around with the mechanics of RPG Maker, though. I've been reading a lot of the tutorials--you all are great resources and a tremendous help--and reading about different topics and their posts in the Forum.
It's great fun just learning how everything works and making something just for the fun of it. At the moment I have no plans for an actual game, just having fun with the RPG Maker program.