-Tiled-

<style> body { background-image: url("http://i36.photobucket.com/albums/e42/gold_n_grand/butterflybackground.jpg"); background-position: 50% 50%; background-repeat: repeat; } </style>

<style> body { background-image: url("http://i36.photobucket.com/albums/e42/gold_n_grand/paperclips.jpg"); background-position: 50% 50%; background-repeat: repeat; } </style>

-Graffiti Tiled-
Ok. There are soooo many, that I am giving you a link to them: Click Here
Now. Which ever one you want, highlight the URL link and place it in this code where it says INSERT URL HERE. Here is the background code:
<style> body { background-image: url("INSERT URL HERE"); background-position: 50% 50%; background-repeat: repeat; } </style>
Oh, and please ignore the copyright signs, they are in there by accident. :S