W3Schools

This website will be INCREDIBLY important when it comes to learning html/css so PLEASE use it...

1) Betty's Graphics

tons of assets of all kinds to use for your site

2) y2k

Blinkies, buttons, stamps and teddies

3) 88x31

HUGE button collection

4) Adrian's Blinkie Collection

TONS of blinkies, buttons, stamps and banners/dividers

5) goblin-heart.net

Tiled backgrounds