Pineapple Mama: Seat-belt Travel Pillow Tutorial. I've seen this pillow in other places, but had not seen a tutorial. It is very simple, and I know would be very useful for passengers - especially the little passengers!
I would've never thought of it, glad someone did. Fall pillows made from inexpensive placemats from Walmart. Rip seam open a little, stuff them, and sew up edge.