Fold a 5 1/2" X 8 1/2" piece of Thick Whisper White cardstock in half. Crease with a bone folder to get a nice crease.
Attach a 1/2" X 4 1/4" piece of From My Heart DSP to the inside of the card. Make sure to get a pretty part of the pattern in that half inch. (I didn't the first time. YUCK!)
Attach a 6" X 2 1/4" piece of From My Heart DSP to the envelope flap using Tombow multipurpose liquid glue. Trim to fit.
Cut a 5 1/4" X 4" piece of Real Red cardstock.
Cut a 5 1/16" X 3 13/16" piece of From My Heart DSP.
Attach the DSP to the Real Red cardstock layer.
Attach the Real Red cardstock layer to the card front.
Using your favorite die-cutting machine, cut out the 'Happy Valentine's Day' dies using Real Red cardstock.
Attach the die cuts to the card front using Tombow multipurpose glue. Or, if you have a Xyron, that would work.
Cut out 3 hearts from the Stitched Be Mine dies using the From My Hearts DSP.
Attach the hearts to the card front using Dimensionals.