A stage-2 Sierpinski Tetrahedron is sitting on a branch of Oldham Bamboo (Bamboosa oldhamia). The date on picture indicates that this was taken in 1994, but really, it was taken in late January of 2001 at the Phoenix Zoo. I had changed the batteries in a borrowed camera and didn't realize that this affects the date.
Two Sierpinski tetrahedra are sitting in some species of Ficus tree at the Phoenix Zoo. Look at the the round building on the right side of the drawing. I drew those lines by hand, and started to correct them but thought better of it. It demonstrates the difference, at least when it comes to me, between tracing and drawing.
The tetrahedron looks like it is part of a garland of flowers that are called Berberis (Berberis haematocarpa), a common name is Algerita. Taken at the Boyce Thompson Arboretum in Spring 2001.
The leafy plant in the foreground is Cape Honeysuckle. The tetrahedra seem to quietly yet brightly fit into this picture, taken at the Phoenix Zoo in January 2001 (the date says otherwise, because I had changed the battery).
The icosahedron is shown off nicely against the circular leaves of the Tipu tree (Tipu tipuaua). The Tipu is a tree legume (they can enrich soil by adding nitrogen). Taken at the Phoenix Zoo in Spring 2001.