I'm getting a tattoo when I hit goal as well!
Okay, technically it will be a while after I enter maintenance--I want to give my body time to redistribute weight and settle at a new weight.
In the mean time, I am getting beads for my mini goals. My fiance bought me a Pandora bracelet (like a charm bracelet, but with silver beads instead of charms) with one bead when I got really serious about losing this time. The first bead represents making a commitment to do it. Then, as I hit mini goals, I am getting beads to represent that achievement. It also helps me stay on track because whenever I am tempted to go off plan, the bracelet is there on my wrist as a constant reminder.