desktopmacmacosserver.appwallpaper
I've seen that single-color desktop background with the familiar serif font showing the computer's name since the 1990s.
I very much doubt that all of the server admins I've come across in that time have painstakingly created actual image files with the same font treatment.
How the heck does one set that up? (I'm in a Yosemite environment with Yosemite servers, and I'm trying to put their names on their desktops. Shouldn't be that difficult, right?)
The apps are not being moved to different desktops, but the desktops are being rearranged. To see the difference, put two apps on a space, then Cmd-Tab to one of the apps. You will end up in a space that contains both apps, although the space will have been renamed and shuffled in the order.
To stop this,
You have to open terminal and type cd /System/Library/Frameworks/ScreenSaver.framework/Resources
and ./ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background. It will take a lot of resources though, so to quit it, you have to quit the terminal window.
source: TUAW and Lifehacker
Best Answer
Use GeekTool, and a script. Here is a collection of "geeklets" that display various info. This is one that displays computer info. I tested it on my MacBook with success.