This is G-5, called Poof. The background is pieced and the white shape is appliqued on top, so it's a pretty simple block. No need to match corners either, as it will be covered!
We are back to pink blocks as I am slowly working on my daughter's quilt. I am filling in on the easier blocks to get up to 144 blocks (hers will be 12 by 12 blocks, not 13 by 13 as in the original quilt).