I created this tree stump over morning coffee. Just experimenting with different techniques and settings. Right after I did the first test print, I discovered that Onebitpixal had already done one: http://www.thingiverse.com/thing:405799
Oh well, here is another version.
These models can be printed flat with no supports or rafts. They have been run through Netfabb.
Scale this tree stump up or down to suit your gaming needs.
(The mini sitting on the stump is actually a 25mm mini, so the stump looks large for him.)