If you would like a patterned background for a website you can create your own....for free!
The mastermind behind this site is Harvey Rayner and all he asks for is a donation and that is up to you!
The beauty of this site is the vast number of creations that can be made from all the color variations, that you create yourself!
Once you get in, there is a whole page of patterns, if you don't like any of those just go to the arrow at the upper left corner and click. There you will find a l-o-n-g list of patterns. triangles, leaves, grass, circles, etc. pick what you want and that will launch the editor. One in the editor you can adjust the colors. You can basically change the total look of one pattern who knows how many times. It's up to you! You can also show color variations as thumbs. You can preview/ re-size/ and download.
Here is one example:
This is the same pattern. The variations seem endless. This is definitely a cool site.