Just the unbranded wallpapers from the XenonHD ROM static wallpapers. They're designed for HDPI screens i.e. (800x480px) but they'd be OK on higher resolution too (even though the app won't allow you to resize them).
There is also an option to choose one of seven solid-ish colours.
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.Download F-Droid