I usually do the same... BUT... just finished refurbishing them from silver to black yesterday... and found I need ALOT more paint if doing a different colour, because obviously all inside needs to be done black where as if it was just refreshing a silver you wouldnt need to:
heres a quick pic of mine
ive got loooooads of photos, going to get the wheels back on car tmrw and sometime on weekend ill do a step by step guide showing progress and what I used etc..