i've done it before,
1st of all buy some enamel paint,i use krylon,black most of the time.
sand down the tirm till all the silver on the outside is gone,not too hard though
remove the wlan,open and power plastic bits for the switches.
get a dremel or a small pice of sandpaper,shave down there you remove the on,wlan and open plastic pieces from,as when you spray them,these area's will be raised,and if you don't shave them down before you spray them the switches won't work
spray with 2 very light coats of spray paint,just enough to cover all the silver
spray a thin coat of lacquer or clear coat on the trim
BANG coloured trim