web postcard

Museum of Canada has a web public program where a postcard of museum collection object can be sent with message. very simple.
I had been vagulely working on a revamped free after admission soundhouse program with a similar outcome, though not web delivered. Rather visitors make postcard (actually a small quicktime movie) in soundhouse and emails this to home or friend.
Mary in EVS has been selecting potential images for use and has begun enquiring about rights for use.
Would this be easy or hard to re-produce here, given an approved set of images??