Art Circles is an app from the commercial site www.art.com that can mat and frame art prints that you buy from them. You do not need to buy anything to use this app.
Viewing circles--connected images by colors, words, themes, or curators is fun and can certainly generate a variety of discussions. Creating your own art circle is an engaging process and you have the option of sharing it with others. Perhaps, if you are an educator, your have students do this in groups. I have used this app with my student teaching classes and they are immediately engaged with the variety of connections.
Compatible with an iPad. Requires iOS 5.0 or later.