ohscience:

Venation network of young Populus tremuloides (quaking aspen) leaf (4X) (via Nikon Small World -2011 - Benjamin Blonder and David Elliott)
ianbrooks:

The Graffiti Tree by TSF Deco
In a secluded, abandon concrete structure in Paris, one can find the elusive Graffiti Tree. View it from any angle but the front and it appears to be an elongated illustration, but when seen from just the right point, it comes alive, seemingly springing forth from cement and expanding into the world.
Opaque  by  andbamnan