Here is some informations about PaintGun Mod for Minecraft 1.4.7 Frostburn that you can need before download it
Paint Mod is now fully released:
To change paint color, press G by default to open the menu. Now Sporting 16.7 million colors.
Here is the recipe:
Download Links for PaintGun Mod 1.4.7
For Minecraft 1.4.5