These chipboard borders were based on Victorian house trims. I can imagine lots of uses, but a couple ideas are shown in the photos with the facade from the Large Haunted House Shadowbox (using the large strip across the top of the roof, and the smaller strips as edge trims on a faux dormer).
One large and two small strips per set (approx. 10-1/2" and 9" long, respectively.)
Design Team Member Laura Carson made a Santa's Workshop Diorama (see the wide photo below). More info in the blog and/or see the supply list.