Upload your photos to Google Photo (Picasa). Create albums, and share those albums with whomever you so choose.
Then, use this app to subscribe to those albums, and turn your phone or tablet into a digital photo frame that automatically keeps the contents synced with the albums you've created and subscribed to.
As you add and remove photos from your albums, the app will dynamically keep its photo content up to date.
Currently doesn't work with any other photo provider.