Can you see what I did? This is so easy and such a fantastic way to use up your scraps. I used a square punch by Punch Bunch to get uniformly square pieces. The edges of the squares have been sponged with dark brown ink as has the edge of the card base.
Place your die cut (or punch) on the quilted portion before it is placed on the card base to cut the aperture. Now a small phrase, picture or contrasting paper can be placed under opening.