For testing, I have several virtual machines running the different system channels: Rock, Rolling and Cooker.
The enjoying side is that I can play with them all, the boring one is that sometimes I don’t remember which one is running what
So for my convenience I made some wallpapers so that I immediately can know which system I am using right now.
Well, it may look like a minor issue but I find it useful to have them anyway.
You can find them at my flickr page. You are welcome to download and use them as your OMLx wallpaper.