This is what I came up with:
I used a scalloped paper punch and cut out at least one from each card. Some I punched out the handwritten sweet notes, some from the front of the cards. There were some cards with 3D animals and couldn't resist - I cut them out separately. I had a canvas and painted a periwinkle color as the background. Then I glued the scallops onto the canvas (I just eyeballed the lines), and sealed with 3 coats of modge podge. I had the letter "E" and hot glued that on top. Viola, done!
Here are some close ups: