This tropical Dwarf black olive (Bucida spinosa, not a true Olive or Olea) with its melted wax feel and gaping trunk is a unique tree that only Mother Nature and Mary Madison's skilled hands could create. It's from the 2008, 1st U.S. National Bonsai Exhibition album.
If the pot was better suited to the tree (or a least cleaned up) and the background was better, the rugged power and reach of this tree would easier to appreciate. Still, if you're looking for unique bonsai, this wouldn't be a bad place to start. Like the tree above it's a Bucida spinosa. I found it at Komunitas Seniman Bonsai Indonesia
The other side, close up. Root over rock. Or maybe rock swallowed by the exposed root trunk would be more descriptive.