These cards are 4b sized (3 1/2" x 5"). To make a template I cut a green piece of paper to the same size as the card's cover and used a rectangle Nestabilities die to cut out an opening.
I stamped the swirl design through the window with white kraft ink.
I like the look but it needed something to ground the white design since it is so loose and flowy.
I put the template back over and traced with a white pen.
Ahhh. Just the look I was going after - The monogram is from A Muse (Classic Alpha Set - clear stamps) and if you look closely you'll see a leaf stamped directly behind the monogram to cut down the white just a bit (A Muse 6-4167D Leaf Frond).