A friend of mine says that mail isn't nearly as fun when it comes in a plain envelope. To that end, she never sends out a naked envelope herself. She decorates her envelopes with a snippet of designer paper that coordinates or matches what she used on the card.
Whenever I do workshops with her I always come out the other end with a matching envelope because she insists. That's quite fine. I don't send naked envelopes myself, jazzing them up with stickers or washi tape or both. This time though, I embraced my Inner Susan and made this card and matching envelope.
The Fine Print: All products by Stampin' Up except the actual envelope. My friend says if you cut up your designer paper into 6x6 hunks you can get a card with matching envelope from each square. That works if you use A2 envelopes. I don't usually have A2 envelopes as I get A6 ones free from work from the recycle bin after graduation. However, this year I only got about 25 of them but I did get a nice fat bundle of A2 envelopes for my birthday. Expect to see more decorated envelopes!