Coloring oak tree
Coloring bitmap oak tree
Paint the oak tree, it will be interesting, since this tree because of its uniqueness, is very common in painting, stucco. This painted a picture, get a good material for jewelry and design.
Coloring in a raster (pixel) format. If you use a graphics editor such as adobe Photoshop, then using the fill can easily paint a picture. Outlines for coloring perfect to spend some time coloring on the computer. For children this can be fun and not an obsessive study of the work in the graphic editors, and knowledge of the world in different shades and colors.
Coloring can be printed, and then paint.