My boss had an excellent idea for her wedding photography - she had an elegant home wedding and aside from official photography at the ceremony provided guests with disposables at each table. The shots which came out of it were stunning. She did have a lot of photographers and designers as guests, so that would have helped.
I thought that was a wonderful idea when planning our wedding, but the last time I used a disposable camera, I was very dissappointed, so in the end decided against it. I'm glad it worked out for your boss though.