Deviant ART. There are other places to find other things of course, like font inspiration, backgrounds, music etc. I also stumbled across another site recently that offers buttons, wallpaper etc. I know most other websites offer these, but this site is different because it also has a web page color composer. (VERBATIM from the The Inspiration Gallery):

An interactive web tool with which you can create a detailed web page colour scheme and generate the CSS and HTML code to be inserted into your web page. Given the number of page elements you can customize using 11 colour palettes, 395 backgrounds, over 2,000 button graphics and many other features.