Sigh, aren't vintage postage stamps so lovely and sweet? Did you know you could still use vintage stamps on your envelopes? You can! As long as the postage adds up to whatever you need for current postage prices, you can use as many vintage stamps as you want on your invites, letters, and cards. Check out this great article on 100 Layer Cake (a gorgeous website) on finding and using vintage stamps. They're also great for crafting and scrapbooking, and sometimes you can find them for super cheap on places like eBay! Have you ever used vintage stamps to send a modern letter?
(Picture via 100 Layer Cake)