Here’s the bottom line:

Desktopia is an application where you can set different background pictures for different times, in which you can specify.
here is a screenshot of the controller.

It’s pretty basic, but incredibly¬†convenient.
It only has one flaw: That it doesn’t work unless the app itself is running.¬†
Now, what you see in the screenshot above is not the app, its only the controller. to make it so the app runs on startup, go to the app
lications folder in Finder, find a file called desktopia, then move it to the dock. right click the dock icon, then click open at login. then, you
can drag it off of the dock. then, in the top right, there will be a flower indicating its running.
click on that icon, and click open at login. when you do that, it should look like the image below.

Thats really all there is to it. You select the image add the time, and let it do the rest.