Backgrounds in E17 can be a thing of beauty, since they can contain all kinds of animations and effects. They are similar to animated GIFs, such as the one shown here:
The advantage of animated backgrounds in E17, however, is the fact that they use PNG files opposed to GIF files, and that they are compiled scripts, which allow for much more complex functionality. When I first installed E17, I created an entire host of animated backgrounds, which I have summarized (and provided links to) below.
To decompile an animated background, use the edje_decc command:
~>
edje_decc input_file.edj
This will decompose the .edj
file into a directory that contains all of the .png background files
used to animate the background, a .edc source file, and a build.sh
script that uses the edje_cc command to compile the animated
background. The usage for edje_cc is: ~>
edje_cc [OPTIONS] input_file.edc [output_file.edj]
For starters, I would suggest
downloading a couple of the animated backgrounds, decompiling them, and
taking a look at the .edc source file and the build.sh script to get a
feel for how they work. Much more detailed information can
also be found in the E17
User Guide under Backgrounds. Additional
backgrounds can be found under the Animated
Backgrounds Section of the get-e.org
website.Animated Backgrounds
 Title: blue-bend2.edj (NOT ANIMATED) |  Title: blue-bend2-e.edj |
 Title:
blue-bend2-l.edj |  Title:
blue-bend2-l-e.edj |
 Title: blue-bend2-l-t.edj |  Title: blue-bend2-et.edj |
 Title: blue-bend2-l-b.edj |  Title: blue-bend2-eb.edj |
 Title: gnome-curves-l-t.edj |  Title: gnome-curves-et.edj |