Well i have been looking into that and will be posting an alpha version next week..
its a forum home slideshow and not a cms one, but I think it could be integrated in cms some time later..
It has lots of limitations, as if you want to cache images there is no point in selecting random images, as the cache becomes obsolete if you never have the same images.
So main thing to select is a comma separated list of image-ids or sticky images (ordered by id) or oldest images (as they hardly ever change)
Also there are some settings to play around..like width, height, speed etc...
to keep it lightweight, it is not done with jquery framework but with yahoo yui 2. as main parts of this are already loaded on forum home.
(it would be much better and more lightweight if we were using yui 3, but there are major conflicts if you load yui2 and yui3 on same page. so switching to yui3 can only be done when vbulletin does it.)
What it does. it regenerates the pictures in a slides folder in your file directory.
It looks a little bit like other known slideshows, but it has a complete different engine.
Here is demo, but urls and css are still all hardcoded so give me a week or so to pack it in plugins and templates.
demo : http://babelart.000space.com/forums/forum.php
(test site... beware some images can have more or less adult content)
and caching of images needs to be looked at a little more..