I took Dancer to a high school open house this a.m., and had to shlep Little Guy along. At the last minute I realized I needed something for Little Guy to do while we listened to people yap. I searched frantically through my 'special drawer' and came across a package of 1.5" adhesive circles, technically called 'mailing seals'. I'd bought them to make stickers for a community event (Avery offers free software online for this).
Lemme tell ya, hand a 6-year old a couple of sheets of blank stickers and some colored pencils, and you can buy yourself a good chunk of quiet time. (Well, except for the whispered, "Hey Mom! Look at this!") Great stuff.