Time to share the last steps -- adding borders and some quilting ideas!
I added three borders to my finished top -- first border is the background fabric and cut 2" wide to finish at 1 1/2". Second border used up all my leftovers from the layer cake (plus a couple add-ins because it was pretty tight) -- it's cut 3" wide to finish at 2 1/2". The third border is the background fabric and cut 4" wide to finish at 3 1/2" wide.
The layer cake leftovers could be pieced together with straight seams but for the fun of it, I cut all the pieces on an angle that matched the angles of the star points.
I cut all the leftovers into 3" wide strips (most of them were already that width) and then laid them end to end in a "random" scrappy order -- spacing the colors evenly for a bit of balance. Once satisfied with the order, I stacked up (on the left) and worked down through the stack trimming the ends and restacked them for sewing (on the right).