Surprising someone with a piece of snail mail is certainly special in and of itself, but sometimes the extra, little details can make a huge impact – especially around the holidays when mailboxes begin to fill up with seasonal greetings! I had so much fun coming up with these 5 holiday card envelope decorating ideas to help you add a festive touch to your Christmas card sending this year! Click on each photo to shop the cards too! No. 1. Banner: My philosophy is: When in doubt, put a banner…