The contrasts in nature. Previous pinner wrote: "The blue in the butterfly contrasts with the brown rocks and red leaf. The almost triangular shape of each section of the wings contrasts with the smooth round stones.
Though it has the word weed in its common name, don't let that scare you away from butterfly weed (Asclepias tuberosa). Sometimes called milkweed, it's as easy to grow as a weed but much prettier, plus hummingbirds and butterflies love them!