The Mockingjay emblem from the Hunger Games movies. Since I couldn't find any truly volumetric, non plain model, I've decided to try and model it myself. I've modeled it on ZBrush and tidy up a bit on blender. This is my first attempt at modeling something with ZBrush so it is not very high quality, although it is good enough to get great results from a printer.
The print in the pictures has been printed using ColorFabb's copperfill, polished with dremel and smeared with black shoe polish.
The model is not perfectly manifold... sorry about that. Slic3r has trouble with it, so I had to use cura instead. Cura handled it with no problem whatsoever.
Edit: I've uploaded a new model fixed with netfabb. It should work now with any slicer software.