Due to heightened security, we are supposed to wear our picture ID badges at all times at work. They double as our key to the facility. If you see someone not wearing a badge, you are supposed to contact security immediately. Yeah, right.
When I first got my badge, I taped an appropriately sized image of Grumpy over my photo. Eventually I replaced Grumpy with a photo of me from 1974 (long hair and a poor excuse for a beard). I have gotten quite a few comments about the photo, but not a word from security. I guess since it is technically a photo of me, they don't have a problem with my modification.
I tried the belt clip thingie for my badge, but now I wear my badge on a lanyard. It's good training for pin trading at WDW.