You can now have a background slideshow rather than a single static image.  Here's how to set one up.

Step 1:

First upload the images for your slideshow, and select each of them in turn so that they show up in the Wallpaper Library (see the video above).

Step 2:

Next, open the Wallpaper Library, and check the tick-boxes of the images you want to appear in the slideshow.

Step 3:

Click Save.

Also see:

• How to Upload a Background Image