It looks like you could have a complete slideshow to select from if you wanted. Right?
Sorry, I've missed your post.
What do you mean by slideshow? Functionality (in general) was not touched by my changes, so, there are no graphic effects like explosions or animation. The only thing I've done is ability to use themes (like skins) and select them randomly at startup.
For example, you have a set of pictures called Soviet_Army, another one called Apaches_and_Cobras and, for example, Red_Roses_with_White_Leaves
And usage of the feature allows you to see these pictures (if they are named correctly) as background pictures in EE. The theme is selected once at startup and isn't changed while in EE. To change the theme you need to restart EE.
For any picture, which is absent in the theme, the default one is used.
No videos, no slideshows. Yet