Here are a few Custom made LOK wallpapers. All Wallpapers that I made are marked with my Sig logo in the corner.
All wallapaers are currently in a 1024x786 size, as that is the size of my screen, and I dont have enough web space left to make 4 differant sizes of the same pictures. Windows Users Right Click the image and Select Set as Wallpaper. I dont Have a Mac and have never used Linux, so I dont know how you set Wallpapers for those two OSs. If they are availible to set for Mac and Linux, then it's Pure Coiencendence. Dont worry, when you right click and set as background, the image WILL become the right size, regardless of what size the images below appear.
You can also Click the thumbnails to see what they look like in full 1024x786 size, before you set them as your wallpaper. Im sure you could Copy-Paste the wallpapers and REDUCE the image size if you have a monitor smaller than 1024x786 without loss of quality, but I don't think you'll be to enlarge them to a size, like 1280x960, without a loss in image quality.