Thanks, you all, for the compliments! Remember that Miriam gets credit for sharing this idea. I think my GS may be a little young to figure out how to fold it up, but we'll see. He's only 2 now, but eventually he'll get the hang of it. For a child who is a little older you could add velcro or a button at the sides to help them figure it out.
The main thing to know about this is that it's basically a rectangular quilt with handles in the middle of the two long sides. If you have one around that has the right shape, you might be able to add handles and voila! If you want little roads and such, there's more involved. Rather than a panel, you could create a patchwork or applique road design. If anyone makes one, I hope you will post the pictures on this site and add a link here.
Miriam, I love your signature verse!