To color wiimotes and other plastic goods, you want to use "vinyl dye". It comes in a spray can, but will not chip like regular spray paints or plastic coatings. It's perfect for mated parts, because the coating is super-thin and chemically bonds to plastics. You can find it in most automotive/hardware stores in various colors.
I used it to great effect on a few of my hacked pure-digital camcorders, and it holds up great to constant handling. Once it's dry you can even polish it for a super glossy finish.
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