So, uh, for now I'm using the 2.0 tarball to do my experiments. But it would be easier for all of us if the _darcs tree were included in that tarball. As a longtime darcs fan, the first thing I'm doing with it is creating my own local repo and importing... but my patches won't be usable in your repo because of the differing context... oh well.
As for what the experiments are....
Well, I'm thinking of using this to generate some of the spot art in a videogame project I'm doing, so I'm extending in more of a pragmatic way. I know the entire concept is that it's context free, but the extensions I have in mind are going to break that constraint, hopefully in interesting ways.... 
The first thing I'm doing, to get myself oriented in the source, is producing something like the "tile" feature but with respect to rotation rather than repetition, so that you can make snowflakes that are actually symmetric. If I don't lose interest, you'll hear back in a couple weeks with how it went.
