I'd like to propose adding live tile support for photosynth.net. According to this blog post (http://blogs.msdn.com/b/ie/archive/2014/05/21/support-a-live-tile-for-your-website-on-windows-and-windows-phone-8-1.aspx) all that is needed is a manifest or XML file on the server side.
I could imagine showing thumbnails + titles of the latest synths in the user's feed or of the recent favorites. Since we already have RSS support (at least on the old site) I assume generating the XML from it would be relatively easy. In fact, there is a helper site (www.buildmypinnedsite.com) doing exactly that, generating tile XML from an existing RSS feed.