Christmas Coloring Book is a nice coloring application for small kids which includes lovely drawings in 3D with a Christmas theme. Among the drawings you will find Santas, gifts, trees, reindeers, and lovely landscapes, among others. To paint the drawings, the kid just needs to select a color from the palette and click on the desired parts to paint them. The palette doesn't include many colors, but the kids can create more by combining different colors in the small palette you find on the right.
The trial version will only allow you to paint the first drawings, but at least you can have an idea of what the application looks like. The program is run in full screen, so the kids won't have access to your computer. Unfortunately, there is no undo option, but if you want you can clear the whole drawing and start again. Another drawback is the lack of printing capabilities. The program offers nice graphics and sounds, and pleasant Christmas music.
All in all, if you are looking for a nice coloring application to keep your kids entertained, Christmas Coloring Book may work for you.