Creating a background tile for your web site is very time consuming and using one from another web site without permission is not the way to go. The links below are to sites offering free background tiles for your web site.

Absolute Backgrounds
Absolute background tiles just the site you need if you want to have a hand in choosing colours gradients and textures. We found this site very easy to use and designed our own backgrounds in minutes. Highly recommended. No registration needed, just link back to their website from yours.

Background City
Background City, another site which only requires a link back for using their tiles. Some nice examples of embossed tiles are here ready for using. If your web site has a need to change backgrounds with seasons such as easter etc. then you can get some nice seasonal backgrounds here.

Juliannes Background Textures
Juliannes textures have some lovely, slightly off the wall, textures. If you want a web site with a different feel, you might just find it here. This site displays its backgrounds without using CSS. The background on this page is a plain grey background but uses cascading style sheet to keep it away from the text.