Big Beautiful Backgrounds
On bigbeautifulbackgrounds.com you will find a great collection of backgrounds
to use for your web pages and/or desktop.
You may use them for any website, including commercial ones.
(Note: BBB is one of the rare sites today that has been kept intact since its inception in 1997;
It was made using Netscape Gold and Notepad on a 486 computer with a 200MB hard drive
and was receiving around 1000 visits/day at its peak era (accumulating over 1.2 million visits during those years).
The good ol' dinosaur's age of the internet. ;)