I recently was invited to participate in a postcard collaboration with Scott Hatt. He started collages on 6 postcards and I finished them. It was a very fun process. I have to say I am hooked on it- The first 6 are the finished ones- then I will add the starters I did for him. I just mailed those to him and he will complete those. I found out about this from the Notpaper group on Facebook. which by the way is an incredible collage site.