The iPad comes with a built-in functionality of showing a slide show pictures when it is in the autolock state after a period of inactivity. You can set-up after how much period of inactivity should the iPad go to the autolock state by going to Settings ->  General -> Autolock. In the AutoLock menu, you can specify after how many minutes the iPad should go into autolock mode. The options are 2, 5, 10, 15 Minutes, and Never.

Auto Lock Setting on iPad

Continue reading iPad 2 Tip #1 – Turn your iPad 2 into a digital photo frame when not in use