For several years these cards from IKEA were displayed in a long vertical frame on a narrow wall.
But I wanted to change out the pictures for some note cards by Woody Jackson.
I just cut off the corners at an angle and slipped them over the corners of the note cards. Then I taped those corners to the back of the mat.
Voila! No damage to the cards if I ever decide to use them.
Now the frame fits nicely above the doorway going from the kitchen into the hall/dining room/foyer area.