Here's a custom that a friend did for me using some of our old Mage Knight minis. Not super detailed or anything, but it works for our games and for what we had to work with it turned out pretty good.

Sorry for the crappy bg, the green circle is on our D&D map. Someone decided to draw on it with a marker that turned out to be permanent. At least it's on the side we never use.

Enjoy and let me know what you think.