We just got in a shipment of different sized frames that are perfect for this.
The butterfly's are so easy to make! Just two items are needed: fabric and fabric stiffener.
Want to try some variations? Try your favorite scrapbooking paper and use Modge Podge to stiffen the wings instead of fabric stiffener. Don't glue them to the shape supporter though! Instead of butterflies try some other winged creature like dragonflies, moths, or angel wings.