A screen saver really would be nice. I've got my iPad installed "in-wall" at my front door. On it, I run Haiku, Bria phone, exacqVision, Sonos and Roomie Remote. Normally, I've got exacqVision running showing security cam views of my front and back yards. I would be nice to have a screen save instead.
FWIW, my iPad set-up is pretty awesome. Haiku acts as my security keypad and also gives me access to home automation (mostly for Lutron lighting scenes and HVAC). Bria acts as a video phone/intercom hooked into my PBX so I can see and speak to people who "call" the house from the door stations at the front gate and front door and buzz them in. ExacqVision lets me monitor the security cameras. Sonos/Roomie let me deal with whole house audio. Without Haiku, it wouldn't be nearly as useful.