After a disaster with the programs (the words literally flaked off the first kind of paper we bought), a few friends came over and bailed us out a few days before I left. Wine was had and everything was good:
My favorite DIY was making mustaches-on-a-stick. They were super cheap (~$4 for all the supplies to make 15-20) and a great way to get our wedding party and family in our fun. We brought them with us to the photos and everyone was really surprised and had a great sense of humor about it. I found the templates online but didn't use those instructions. I put them together using one layer of stiff felt, hot glue and really thin wooden sticks.
I mentioned I made art kits and that worked out so well. The kids were thrilled and it was great that they had something to do during our cocktail hour and dinner.