Here’s it simple-
Wallsaver puts a screensaver as your desktop.
I use it all of the time, with my LotsaWater screensaver, which takes a screenshot of your screen and makes ripples over it. the only problem with using the screenshot feature with wallsaver is that when something moves on your dock with wallsaver enabled, Then the same thing of when you didn’t click on it will be there too. so thats wy I just used some image behind it. in this case, a cool apple spotlight picture. this one.
But to have wallsaver use lotsawater is very hard. What you have to do is open the .saver file in system preferences, change it in system preferences to have the apple image under the options button, then it will actually modify the .saver file itself. then, you need to open the folder containing the .saver file in finder, at the same time as haveing wallsaver open then click and drag the file from the folder in finder to the wallsaver window. I enabled the aoutoactivte as well as the hide after activation, then on top of that had wallsaver open on startup, so the window would appear, then the wallsaver would activate, then the wallsaver window would disappear again. also, you can quit the application and the wallsaver wil still be in activation. also, after you sleep/close the lid of your mac it will still be activated when you open it back up, even without the wallsaver application running.
Here are the download locations.