Those are excellent! The orange shingles are my favorite. Though I think some of them are not working on Firefox; the blue and green vortices are rendered as a single blue rectangle and a single green hexagon.

I wonder how people are using them in a way that is not distracting to the main content. I've found that high-frequency patterns (small details with sharp transitions) can be a bit distracting, but I haven't found a good solution that doesn't compromise the beauty of the backgrounds.