The beauty of digital artwork is it's versatility. As anyone who's ever been involved in promotions will know you can get an image printed on to pretty much anything these days.
Signing boards are quite popular at weddings. This image was printed onto foamex with plenty of white space around for the guests to sign to keep as a memento.
In addition to that I drew iPad caricatures at the reception. Emailing the finished artwork to each individual as we went along. All the caricatures are then made available for the host to keep in their archives.
Notice how you can include the wedding couple's caricature in the template for the guests. Their caricature appears on their phone immediately. No need to carry and protect a drawing for the rest of the day.