These two are available.

First is Slideshow--the max width for any photo is 455 pixels (a theme limitation). The sample images are as large as they are allowed to be, given the theme that was chosen. A black frame is the only color available. We cannot change the theme, which is the overall presentation (i.e. fonts, positioning of columns, headers, footers, etc.)



The one below uses a different format called Slideshare--it requires an original format of Powerpoint or PDF. Someone would create the Powerpoint or PDF, then upload it to slideshare.net , where it could be "pulled" for use here. For it to automatically change, it looks like an audio track is required. Width, height, and placement are possible