Paint Lola

Paint Lola is an app based on 'Paint Pot' - it lets the user draw on the screen in different colors, and then can update it by taking a picture and draw on that instead.

On a historical note, PaintPot was one of the first programs developed to demonstrate the potential of personal computers, as far back as the 1970s. Back then, making something like this simple drawing app was a very complex undertaking, and the results were pretty unpolished. But now, anyone can quickly put together a fairly cool drawing app, which is a great starting point for building 2D games.