We set up an assembly line to fill baggies, then tied with pretty ribbon and added stickers. Also, another church's youth group has an unusual fundraiser. Even though we don't belong to that church, we've enjoyed being flamingo-ed and paying to have the birds go visit other neighbors. Cut the card stock in half and fold so it opens like a card. Let them dry.
Older children can write simple messages inside using markers.
When dry, group several together, tie with coordinating ribbon into a little packet with the envelopes. You can also tie on a little tag explaining the purpose of the fundraiser. Put them out in an area where adults are, or go around to classes asking them to purchase. This year we are creating Hats for Missions. We think it will be fun.