butterflies for sure
you could also make some assorted butterflies from felt (maybe decorate them with squeeze on fabric paint-some plain, some with a touch of glitter) and attach with staple gun to those cork notice boards (you can paint the frame to your color choice) and hang on those pale green or pale blue or lavender soothing walls.
I used to make a lot of felt decorations for my boys rooms when they were younger. I also loved Frank's felt critter garbage can idea on the repurposing thread.