Educational programs for kids are hard to create. That's why the market fot such products is still in development. But some of the publishers are doing a good job. FillToy is coloring book. It has all the ingredients to make your kid happy. He can fill with color, save his drawings or add others.
Your child can choose from 15 images in the program or 5 available to download. If it's not enough he can choose from his own collection of images. But beware! Only BMP and PNG images can be draw. Other formats even if it can be opened, cannot be colored.
All the interface is based on a cartoon style, just to make the commands more intuitive for any child. The user cannot draw lines or objects.
Pluses: the cartoon style interface; choose your own images;
Drawbacks / flaws: you can only fill with color, without drawing anything else.