I cut some green 2 1/2" squares and plopped them down in the center of the gold stars. See? The green centers tie in with the string blocks. I still don't know if I'm up for removing all the red centers from 28 blocks and adding the green ones. Still thinking about it.
Addendum: I've decided to replace the centers of the gold stars with green squares. Six done so far, 22 to go. It's tedious, but I like the results.