Drawing4Kids is a wonderful free drawing tool for kids that allows them to draw whatever they want and also paint nice pre-made drawings. The kids can draw with a pencil, different types of brushes, and an oil brush. They can even add clipart and paint their drawings with lots of colors. The program also includes a great variety of pre-made drawings that include animals, people, and landscapes, to name but a few. They are all very attractive and include really cute characters. The program even allows you make your own creations over the drawings. Unfortunately, it lacks an undo button and you won't be able to print the drawing directly from the program, but you can save them and print them from another program, though.
What is more, the program is absolutely simple and easy to use, so that kids can use it without problems.
In short, Drawing4Kids is an excellent program that will help you keep your kids entertained for a while completely for free. It lacks a few features, but still is a nice program that definitely deserves a try.