After unlocking Painter Smurf (using 30 Smurfberries), you will be able to paint the roofs of huts, fences, benches, bridges, etc. At first, only the first three colors will be available (Blue, Red, and White). To unlock the other colors, simply play the Painter Smurf's minigame and complete all the pictures with at least a "close to perefection" ranking. (Note, you cannot unlock colors in "Practice" mode)

Unlockable	How to Unlock
Brown	Complete an image of a Lamp Post.
Dark Blue	Complete an image of some Mushrooms.
Green	Complete an image of Smurfette.
Grey	Complete an image of a Well.
Maroon	Complete an image of a Smurf Hut.
Pink	Complete an image of Papa Smurf.
Sky Blue	Complete an image of some Flowers.
Violet	Complete an image of a Cake.
Yellow	Complete an image of a Gift Box.