dynamic slideshow?

so I’m new to wordpress and I have a slideshow of thumbnails that I would want to create.
here at my static websitehttps://www.baseshamai.com if you click portfolio you will see what its like. (using jcycle by malsup)

now if i wanted to be able to add thumbnails dynamically to this slideshow is that possible?

i can’t seem to add a category or id to a thumbnail in the gallery so how can I grab it in php and loop through all of them to add it, like you would a post.

the truth is those thumbnails are a big sprite. so dynamically I would only add a sprite of 9 thumbnails at a time. and somehow set a loop to make a new ul for every 9 li’s