I ordered Medium Round Monogram Labels/Stickers from Wedding Favorites (also available in mini size as well). You can choose from a variety for colours and fonts to compliment your wedding. The monogram labels were pretty and chic and were used to seal the gusset bags that housed our Jelly Belly candies. To identify the kids' favours (they had different flavoured candies) from the adults, we stuck a monogram sticker on the outside of the mini-bamboo steamers which packaged each bag of Jelly Belly candies nicely.
I didn't actual order anything from this website, but it gave great ideas, and even sent some samples of their items at a reasonable price. Having the samples at home gave me my own ideas to put the m&m favors in.
Click on each tool to see a sample.