CSS by example? Elements of design?

I'm now looking more closely at CSS (after saying I could get away with ignoring it). Building on the basic insights of LessCSS and OOCSS, I'd like to go through a bunch of CSS examples and ... do whatever comes naturally.

For example, here is a list of CSS examples. Or I suppose I could have looked at StackOverflow to start with. Another list of tutorials. Really, there's a lot written about Web design. Go figure.

Another good reference.