this tutorial from Oh Fransson to make the blocks for the front and I enlarged this block with a low volume scrappy background for the back. I really love how the back turned out. Also, this friend is a mathematician so I was really excited to find the black print - I don't think it's visible in the picture, but it is an arithmetic print!
The nursery has dark blue, lime green, and orange furnishings and decorations, so I looked for fabric in those colors for the front.
this quilt by Kelsey at Everyday Fray.