You can also use it to easily add painterly effects to photographs. The paints are so real they blend perfectly for each medium and some can even drip, etc. There are oil paints, crayons, markers (which similuate getting dirty and bleeding), watercolors, chalk, and many more.It is beyond fun, especially if you have access to a drawing tablet. A small one costs about $90 and you can get them at compusa or online. Wacom is a good brand but there are cheaper ones I think. The drawing tablet makes it more interesting because depending how hard you press the stroke of the brush is bigger or smaller. You can also erase with the eraser side of the pen.
Here are two example paintings I made but unfortunately, I only had a mouse that time, so the brush strokes are all the same width. It is still very fun, I would almost say therapeutic.
These ones are called Wheat One and Wheat Two and are inspired by wheat fields and basket weaving.