It never occurred to me that I could just buy wildflower seed packets and put them out on the tables.
Or, better yet, get a big clay planter and fill it with seed packets by the exit with a sign that says, "thank you!" This is my trick for not having to buy as many favors - you buy 100 seed packets for 150 guests - chances are, you'll still have some left over.
(source)Wildflower seeds are great because you don't even plant them - you just throw them on the ground and they grow! These would have been perfect for our wedding, since it was at a nature center (although perhaps we should check to make sure the wildflowers are not an invasive species), and they would have been a nice potential alternative to the candy that we had as favors - it's two totally different things, people could take one of each or just one, without feeling guilty. Of course, you don't need to have favors, but if there is a family member that thinks that you do need to have favors, this is a really easy way to silence them.
Any other ideas for really easy favors you can put in buckets by the exit?