The Bean bag Cube - Good tutorial could trim edges with fun colored cording. Imagine this with some Amy Butler or the like fabric. See other materials used for stuffing these (bubble wrap, scraps of fabric...). Buck wheat hulls would be too expensive for this project (5 lbs of this is $25-30).
Rollie Pollie! DIY bean bags - it'd be nice to have one of these for each kid so they'd stop jumping on my couch!!