My dad recently remarried a woman who I adore as a stepmother. When they came back from their honeymoon in Mexico, they brought me a tiny hand-carved fish whose tail bounces like a bobble head. It only takes up about 1 or 2 square inches, so it's space efficient for those crazy tiny booths, but its a wonderful tiny reminder of the support of my family. Plus the fish is bright and striped, so it instantly adds a bit of fun to the booth.
Since I'm freelance, I don't have a booth that's all mine -- if I did, I would probably decorate a bit more. But I've found that just a little token of familiarity or of sentimental value can go a long way to help comfort and relax me, which I always look for right I call the first standby.