The idea of a folding floor cushion for kids is nothing new; I've seen several variations of this project online. However I still wanted to share because I think it's such a great project. To make my cushion, I loosely followed this tutorial by you and mie.
Materials and cost:
4 extra firm pillows: $24
1 full sized bed sheet or approximately 2 yards of fabric. I got a vintage sheet from the thrift store for about $1.
8 5/8" or larger buttons: $1
Total cost: $26
I made a few minor changes. Since my fabric was fairly thin, I ironed light-weight interfacing into both hems along the long side of the cushion cover, where the buttons would go.
It fits perfectly on the floor of Vera's closet, making a comfy place for some quiet reading. One of the best things about this cushion is all the different ways you can fold it. It would also make a great floor cushion for movie night.