for paint their rooms. as for the boys, you can go with blue jeans, dark blue, turquoise colors and so on. they would prefer to have the colorful ones, not white, or probably wallpaper.
related posts of "get ideas for painting kids rooms" is to be able to click on a spot and create a dot at the point, and while holding down the mouse button down have an arrow that follows the mouse from the dot to the mouse point, and when the mouse is released the dot and arrow disappears.
i have no idea how to do this, any help would be welcome. 