Photo frames may be a great way of displaying images. Instead of static photos, they can cycle through bunch of them that keeps your attention for again and again. If it updates photos automatically from sources like Flickr then its better. Samuel got a Raspberry Pi from his girlfriend and so wanted to make something for her. So he decided that active photo frame should be nice. So he build pretty fun device which keeps updating photos from Instagram and Flickr. Another great feature is motion detection, which turns LCD once somebody closes in.
Photo frame parts include USB based WiFi adapter which allows connecting RasPi to the Internet. A simple passive PIR sensor serves as motion detector. It is attached to Raspberry Pi GPIO. Photos are updated by using Python and APIs that sends requests for new images. Final touches like original frame completes it.