Background Images

You may designate an image to be the background of your web page. You may use a small image and use multiple copies of it to tile the entire background. Or you may use a larger image and have one copy of it cover the entire background.

See cs-netlab-01.lynchburg.edu/courses/Networks/index.htm

If you view source on the above webpage you will see that the body tag is the following.
<body BACKGROUND="netback.jpg" text="#000000" link="#0000EE" vlink="#551A8B" alink="#FF0000">

You may always download the background image of a webpage by right clicking on the background of the webpage and selecting
"Save Background As .. "