--> Edit 2015-10-05: I added new files, one STL that I have thickened a bit with MeshMixer (the pumpkin face pattern inside was a bit thin in some places) and the same file but with custom support beams by MeshMixer. So you can print supportless, the support structure is a mesh of it's own that supports the pumpkin mesh. <--
This is an evil halloween pumpkin where you can put an LED light under so it will show it's true nature. The eyes and mouth are carved out on the inside!
I hollowed out a pumpkin model (http://www.thingiverse.com/thing:41194) and cut the bottom so it can be placed over an LED light.
I carved the eyes and mouth out on the inside so these areas let more light through but in daylight it looks like a normal pumpkin.