I made a root over rock Bonsai from an exposed root Chinese Elm. It was a little fiddly, but I like the placement of the roots and the contrast with the stone.
Exposed root | Bonsaihunk's Blog
Exposing the secrets of “Exposed Root” bonsai trees. | HERNK'S JOURNAL
Exposed root | Bonsaihunk's Blog
Creating an exposed root - Swindon & District Bonsai
Stone Lantern & Bonsai Bark - This impressive exposed-root tree is a Trident maple. The leaves are a dead giveaway. It's from Doug Paul's Kennett Collection. SITE WIDE SALE - Hundreds of
Neagari – Bonsai Today
Bonsaify | How to Create and Improve Exposed Root Bonsai