Here are three basic designs for backdrops using ideas of basic shapes, patterns and gradients. You may use these in your projects with given credit.
The idea of an area or scene being created with such uncomplicated shapes is amazing, especially if the color scheme is used properly. The purpose of these backdrops are to be used by beginners to get an idea of what a proper background SHOULD look like. If you are new to scratch art, then take a peek! Try to make one yourself! These are just ideas. I would use a more intricate background for an actual game.