People can sew names into clothes, etc – but this is an idea I’d never heard of and a product a friend of mine told me about.
Temporary tattoos for your kid’s arm for days when the playground is very busy, on your trip to Disneyland, or (if you’ve got a runner… like a certain branch of the family I know) for when you go to the mall.
This is one of those smack yourself in the forehead brilliant ideas everybody wishes they had had once they learn of it. LINK
There are a lot of great designs to choose from.