The current plan is to do two more like this (i.e. self contained geomorphs with exits on one or more sides) ...which will mean that the first 30 maps will provide you with two variations of each type of entry/exit configuration (e.g. 2 left turns, 2 right turns, 2 crossroads, etc.).
After that I'm planning to change things up a little, so that larger caves can be built by putting 4 tiles together - just to add a bit more variety.
For a quick example of what I mean see the picture below: