A long while ago (about 4 or 5 years ago) I learned HTML and made some pretty generic websites about nothing interesting. Recently, after seeing a bunch of beautiful WordPress designs (like this, this, this, or this). I currently have no knowledge of the current web standards but I'd like to learn how I would be able to create designs like these. I figured it would be easiest to start to learning design through just skinning current web apps before learning to code my own. (Yeah, I know I'm probably WAY ahead of myself there).
I'm not sure where to start. Can someone point me in the right direction?