Tree Topper holds most models with a 60mm round base. It's shown holding Dutchmogul's amazing Njordsdottir and Undead Treeman. Putting a little LED light in it makes a huge difference! It could also be used as a nightlight lamp too.

Thanks for looking!

Here's where to find the models listed above: http://www.thingiverse.com/thing:1092700 http://www.thingiverse.com/thing:1086870