Purples...This fractal is named "Phosture." It was created by Linda Allison using the program Ultrafractal, written by Frederik Slijkerman (ultrafractal.com). You can find "Phosture" at allisonart.com; Gallery 9 (of 20 galleries).
Begonia Escargot leafs present both the spiral and the branching fractal of the leaf-veins. Their construction responds to plant's both needs for correct water distribution and for strengthening structure: "leaf vein networks differentiate roles of leaf support and hydraulic supply between hierarchical orders."