A: They are by no means mandatory. So if you can't afford something you really like, just let 'em go. Your guests won't even notice. But there are a few ideas that can be pulled off on the cheap. Get two things for the price of one: Your florist can design breakaway centerpieces, so each guest can take home a tiny bouquet of flowers or a pretty plant. And some of the most guest-pleasing favors—a sweet little bag of candy, tiny packets of flower seeds—are also some of the least expensive. Lastly, some brides opt for making a donation to their favorite charity, and print up cards that read: "In lieu of a favor, a donation has been made to the ASPCA." You'll help out a good cause with the money spent, and your guests will be touched by your generous spirit.