Cactus!
I just completed my very first metal cactus. It's a 3 foot tall prickly pear, and it looks great, if I do say so myself. Okay, it's technically not done, since it does not yet have glowy wire on it, but all the bending and cutting and welding is done. I'm so excited! Maybe I'll do a barrel cactus next, or work on designing my saguaros.