Spawn Illuminati by Elements of Design is an iPhone and iPod touch beauty. Even though Spawn Illuminati serves no other purpose than entertainment it still creates some rich effects that can be controlled and altered with your fingers.
iPhone and iPad apps tagged "artistic game."
Koi Pond: Find Zen Bliss With Relaxing Pool of Virtual Fish
The intrepid Blimp Pilots development shop just released Koi Pond 2.0 with a variety of new features. The 1.0 version was great; the 2.0 version adds a variety of improvements to the Zen experience that is Koi Pond - movable lily pads, 3D sound, the ability to feed your fish (try shaking the phone), and finger nibbling (hold your finger still in the water and see what happens).