Ethereal surfaces. Check out this irridescent material. Soli Architectural Surfaces makes seashell mosaic tile, something we've never seen before... It uses actual seashell pieces. When installed, it actually appears seamless, so you can cover all sorts of area with it without worrying about even spacing of tiles. The 12x12 tiles interlock in such a way to install seamless and each shell piece in each tile ranges in size from 1/4" to 1".