There's the addition of the ROCKtoSAND stuff at the bottom though, but it works just like the normal rock, only it's a bit harder to figure out since the sand hides the bottom... You have to actually read the names (flat, convex, concave) to figure out which one to use where, although once you get used to it you can actually see it yourself.
![Image](http://www.duckandcover.net/tactics/editor/tutorials/mountainred.jpg)
Additionally I highly recommend using the N, S, E, W tile selection options at the top of the tile list since it'll save you from looking for more "random matches" to avoid the tiles repearting.