this may sound daft, BUT here goes anyway
You can create your own backgrounds, and design them in vsd
add an oblong image the size you want to a blank page, then use the styles tool, to change its appearance to what you want
then preview it, and save as "template1" whatever you like (reduce quality in photoshop or similar)
you can then select it as your background image, this is just an example, but basically you can do it with any picture or scan or texture you can find
i will upload one i just did for you in about a minute, but if you go to my shop in signature, all my vsd product pages were done this way