This is made with SBM elements. The holly is from Bobby Bear Christmas Card 2 (booster pack). And the wordart, christmas flowers and ribbon overlay are from MA3, thanks for sharing!.
Simply, for the card: cut along outline and fold in a half. For the envelope: cut along outline, fold the flaps and glue the sides underneath the bigger flap.
I Hope to not violate any copyrighted design!
Please, let me know if it works for you.