I use Apple TV's and HDTV's throughout my studio to display my photography. When I did my last update to Apple TV for some reason it forced a factory reset and while it was no big deal to set it up again, I discovered that there were a couple new choices in the Slideshow/Screensaver area. One of them is called Photo Wall. I love this one because not only does it frame your images in a variety of nice frames that float by, it adds nice touches like mattes and a 3D spin when it hits the corner of the virtual room. It's like you're walking along a wall of photos and you get to the corner and turn to walk down the next wall. Nicely done!
You can get an Apple TV 2nd Gen here for $99.