I love these muslin bags. Anthropologie used to use them for gift cards and now I keep seeing them pop up in Martha. I think that they would make great bags for favors, maybe even invitations or programs. I bought a bunch last year to play around with and I haven't had a chance to see what will best for printing. I'm going to start with rubber stamping and letterpress. I'll keep you posted on my progress.
left image: scanned from Martha Stewart Weddings Fall 2009
right image: scanned from Martha Stewart Living
