"Rapunzel 3" by Jennifer Steinkamp
I like this piece a lot. There are 3 separate patterns at work here, those of the pink, blue, and yellow flowers, respectively. They combine to form a larger conglomerate patterns. Although the patterns are not strictly repeating, for example the pink flowers get less dense toward the bottom of the piece, there is a clear evidence that there was planning involved with the location of each flower and there is a pattern present.