You can put images into site footers. We used to use the wysiwyg in the footer to make it easier to do - though this could mess up adding custom scripts and so on, so on balance decided to do without it.

Possibly the easiest way to add the images is to first add them to a random page of your site in the order that you want them, using the wysiwyg, then go to View -> Source code to view the HTML and cut and paste it into the Footer section of the theme options.

Thanks

Joe