I did this piece for a contest using only one shape manipulated in photoshop many many times over and over again. The rules of the contest was to only use the one shape to create a work of art. You can change the color, size, and even warp the shape as long as it was evident that it was used (see the insert). I got second place.
(Should I be submitting all my art in at once? Or should I wait like a day or so to submit new ones?)