All kids networks has a great butterfly craft for kids to make and shares an example of ink blotting using a butterfly cutout. Kids will love to paint the one side and see how the wings become symmetrical. Their post includes a butterfly template printout so all you need to do is cut out the paper.
http://www.allkidsnetwork.com/crafts/bugs/folding-paper-butterfly.asp
Piggy giggles has a really simple paper napkin butterfly project. All the kids need to do is color the napkin with markers, spray with water and tie up with a pipe cleaner.
http://www.piggygiggles.com/crafts-for-kids/decor-crafts/paper-napkin-butterfly-craft-easy-activity-young-kids.html
No time for flash cards creates a butterfly sun catcher which uses construction paper, contact paper, ribbons and crayons.
http://www.notimeforflashcards.com/2012/02/toddler-butterfly-craft.html