I strayed a bit from the sketch but have the same out of the box idea. I stamped the butterflies image (all one image) on My Minds Eye paper, then with a see through ruler penciled the box around the image up to the butterfly's wings on each side. I used my paper trimmer to cut 3 sides, then hand cut the top and around the butterflies.
Supplies: Stamps - Inkadinkado, Papertrey; Paper - PaperTrey Stampers Select. MME dp; Ink - Versamagic Jumbo Java; Misc - brads, dimensionals.