Keys. Everyone has a set of keys to his or her most important keys of the house, bicycle, car, office, but possibly other keys. It is of course nice to personalize your keys. A bunch of keys look much nicer with a cheerful key chain, but it also gives a sense of recognition. That's easy when you have lost your keys, or if it is next to other keys. It would be fine if you take the wrong keys. A key ring is a great gift idea!