I did my case in the ferrari combo (red/black) some days back. Will post pics later.
Here's what you'll need:
1. 1200 grit sandpaper (a very fine sandpaper)
2. Spray Can of the colour you want to paint it in
3. Spray Can of clear lacquer. I would suggest you to use 'Win's lacquer because I've worked with it and the finish is great.
4. Cutting cream
5. Polish
Here's what you do:
Wet sand the case. After doing that, clean the case with a wet cloth so that there isnt any dirt left on it. Paint it using the spray can (Coloured spray can). Keep the can 10-12 inches away from the case. When the paint dries, put 3-4 layers of lacquer in the same manner. Leave it to dry for a day. After its dry, wet sand it again using very mild pressure. Now you should have a rough surface again. Bring back the shine using the cutting cream and the polish. Hope that helped