Here's my card for the current sketch at Sunday Stamps. The first thing that popped in to my mind when I saw the layout was an envelope, so that's what I ran with for my design.
Lil' Inker Designs Sending You set, was stamped near the bottom of the card in navy ink. The finished panel was adhered to a coordinating red card base to complete my easy to mail Valentine.
Sending You stamp set, Stitched Hearts dies (Lil' Inker Designs); Memento Nautical Blue ink (Tsukineko/IMAGINE Crafts); markers (Copic); Cherry Cobbler cardstock (Stampin' Up!); foam tape