Crackberry also has a web driven wallpaper creator. It seems pretty smooth. All you have to do is provide the image, then pick the BB screen size(including the storm) and it emails the new re-sized image directly to your BB. Custom CrackBerry Wallpaper | CrackBerry.com
Do a google image search for "rush band album art" to get a ton of images you can use the above to convert.