I like your interface for switching between the backgrounds and having a small panel to tweak the parameters. I played around with procedural patterns using SVG/canvas/webgl a while back and this makes me feel like re-packaging the way it's represented.
Thanks, I've designed a few UIs for manipulating graphics and spent a few tries iterating and improving this one in particular. There was a need to show as much background as possible, sometimes the limitations lead to some creative choices. I'm quite pleased how it came out myself.