Check my project thread for pictures of painting the calipers. Leave them on and paint them, leave um to dry for 2 hours then put the wheel back on. Don't drive until the next day though. If you have axle stands you can get it done a lot faster. I had to use the standard jack on all 4 corners seperately.

Looks great even with the calipers left one. Makes a massive difference especially if you get a bright colour.