Okay, who wants a cave?
Reply to this topic ASAP and I'll give you one or more screens with which to build your caves. Instructions will follow once we've got enough screens and people.
You won't have to build any new combos or tiles for this, BTW. All you have to do is lay the combos out on the screen. If you need to layer something, you'll get the entire right side of the map for that, as well as the map above it. Just make sure you use the matching coordinates, otherwise you'll overwrite someone else's work, so follow my instructions very carefully and don't deviate. (Again, otherwise, overwriting will occur.)