I horrified my office when I showed up with a bunch of fluffy kitty, puppy, 1960's style flower, etc keychains - I had picked them up in the dollar section of the local Target. And now I don't have to worry about the stupid piece of paper I taped to a key falling off and leaving it unidentifiable... I know that the pink and yellow daisy is the storeroom key!

You can probably find not-quite-so-horrifying ones at your local dollar store.