I have found jelly roll, layer cakes & fat quarter patterns at Jordan Fabrics. They also do videos which are excellent.

I found this idea on Pinterest - super simple layout, so I don't think it would be that hard to figure out...

She says it is for sale on Craftsy but it seems to have expired there.

http://www.lynbrown.com/p52/

Wickedly Easy (free pattern)
https://www.byannie.com/wickedly-easy-quilts