Well it doesn't have to make Bookcase cards...right?
Here I've made stacking boxes and added panels using the Stitched Framelits.
Cute little images in any colour you wish and there you have
a cute way to present a baby shower gift etc.
Box 1 - (cube) 2" x 2" x 2"
Box 2 - 2" x 4" x 2"
Box 3 - 2" x 6" x 2"
15 images stamped on the smallest Stitched Framelit square. And away you go!
3 Boxes separate and stacked then held in place with ribbon or twine.
Simples.