Collect, test, and experiment with interface pattern pairings of CSS & HTML. Pears is an open source WordPress theme, enabling people like you to get your own pattern library up and running quickly.
I would be most curious to see what sort of CSS this encourages. One of my biggest frustrations with writing CSS (at least, when I do it) is that it gets sloppy, very quickly. After awhile, you hold your nose and just add more rules to the bottom of the ever-growing CSS file. Would Pears encourage better segmentation and organization of CSS?