I'm behind variart, thanks for submitting this. It's a bit early, I just took the wraps off late last week but if you have any questions or comments, let me know!
procedural art is not a new space! please collaborate with some established artists, or at least young imitators of established artists in this space. It's a slick implementation of an interesting idea but you need to offer things worth putting on a wall.
It is certainly my intention to open up the API more and allow folks to create their own pieces. In fact, I hope the community aspect far outgrows the "seed" pieces that I created to launch the site. However, in terms of launching an MVP, documenting and hardening the API for anyone was too much to take on right away.