I got this one from The Readymade Blog (Readymade Magazine). It's Haute Note which lets you pick a card design, you provide the text (or leave blank) and they print them and send them to you. They have some really cute designs and this would be a good idea to do for any occasion or holiday.

Who doesn't love getting fabulous invitations in the mail for any occasion? I certainly love them. It's sort of a past-time reserved for really formal occasions, but I think we should bring it back.