You might want to check out Dapper, a feed creation tool which allows for dynamic inserts (ie. search terms etc.). So I *think* you could just create a few searchable feeds from various image/video sites (ie. Youtube) and have those results show up in your listing.
They have a demo at
http://www.dapper.net/dapperDemo/ which shows how a user can create a dynamically generated list of videos based on any given keyword.