There isn't a person whom we know (that owns a computer) that isn't into a source for free backgrounds that do not come laden with watermarks. Here's a resource which offers free hi-res images which are fully customizable to your personal color preferences and repeats seamlessly, no matter what size your screen is, big or small!
Although there's many a background website, we have a serious love for patterns. Although a funky background of a ninja kitty conquering New York city is awesome, we prefer to be able to locate all of our folders and icons easily. Because of that, repeating patterns come in quite handy, though they're not always attractive.
Sure we could make our own each time the current one feels stale, but that just seems like a waste of time . Pattern Cooler is packed with pretty patterns (go figure) that allow you to change the scale and colors in each one. They've done the dirty work for you and are just waiting for your customization — or use them as is. You can download your files in any of the following formats: PNG, JPG, SVG, or PDF.
You can of course leave a donation for this awesome service, we're sure they'd be more than grateful if you have a few bucks floating around in your paypal account.