I saw these while surfing at www.craftzine.com what an adorable gift these flip flop slippers would make for your guests.  For those crafty DIY couples these really do not seem to be too difficult and you could have tons of fun personalizing them for your wedding.   I would tie a ribbon on one of the flip flops to attach a card announcing you have made them with love for them for sharing in your big day.

The directions were posted by the creater of these adorable slippers, Lady Havartine on her blog with plenty of photos and directions it is so cool that she would create a tutorial to share with all of us http://www.ladyharvatine.com/2007/06/summer-slippers.html

Good Luck and Happy Creating!