Drawstring Quilt 2 by Siffstitch
I saw something like this online selling for $50. I figured I could probably make it cheaper. The idea is that you can use it for a child's play surface, so your child can spread out all the Legos or whatever, then to clean up, just pull the cord to cinch it shut into pouch.
This one for my nephew. I used Tutti Frutti (print: Haiku Small Stripes on Blue) and Symphony (light royal) fabrics with Warm and Natural batting.