I took mine off and painted them. YOu need to disconnect the battery for about 15 min because you have to mess around close to the airbag and you dont want it going off.
there are two screws on the side of the steering wheel main body. remove those. this will allow you to pull the airbag/horn button part off. i left the wires connected and just moved it over so i could get to the covers. once you get this far, they just snap on/off. I painted mine with krylon plastic paint and they have held up great since.