EvolutionRGB is a senseless and beautiful iPhone game of fire, plants and water.

It allows the player to draw on the touch screen using different elements, like fire, water and plants. These elements interact with each other, so that the screen evolves over time. The iPhone’s builtin accelerometer is used for the gravity direction so that water always falls down and fire burns upwards.

http://code.google.com/p/evolutionrgb/