i finished the backing last night.
i decided to go with a courtyard steps log cabin around the star block. the large block is 24". then i used the remainder of my kona khaki as the background. it's purposefully off-center though it's hard to tell here. i used it's a hoot dots for the rest of the backing.
i had already cut out the batting long ago so the next step will be basting. hopefully i can get that done tonight and be ready to quilt by the weekend.