I found this project, yes, on Pinterest (I will look up the orginal site I just can't see to find it right now) but it was for a doll sleeping bag. I decided to make one for Madelynn.
She chose the fabric herself, which I LOVE because it says Science Rocks! Fantastic.
There are 3 different fabrics - 3 layers. I bought a yard of each and just lined them up, trimmed the edges, cut a 4x4 inch square from each corner (remember to fold the top layer down. I just guessed on this part.). Then I cut 1" strips 4" long all the way around ( I used a 4x4inch piece of cardboard as a guide and then drew 1" lines on it to help space the strips correctly).
Then you tie them together just like you were make a blanket. On the sections where there are 3 pieces of fabric I kept two together and tied it to the top one. I did this in about an hour so it is really not that hard.