Painting my wheels matte black with a satin clear coat was one of the best mods I've done yet.
My main reason was to make the brake dust a lot less of an issue (especially with the HSV brakes!) and I also happen to think it looks awesome!
I am contemplating a thin red stripe around the outer rim of the wheels though just to break up the black of the wheels and tyres, about 2mm - 5mm wide. Maybe.
Here's how they are now. The real thing, NOT photoshops...