CSS Tux is possibly the best place to go when u need a little bit of design inspiration.
Link:
csstux - The best dressed sites on the web
they are a protfolio of hand picked sites of the month. The sites, I believe, are all pure css / xhtml and usually they look really great.
You can also look at
css Zen Garden: The Beauty in CSS Design if you are looking to jump right into css / xhtml development.