I've decided how to work the background on these rose star blocks. I'm going to give each one a different background, forming the block into a large hexagon. It takes 18 pieces to make the background for each star. When the background is attached, the resulting hexagon is 9" across.
Here are the two the I've stitched the background to so far - I've placed them together so you can see how they'll join up.
This is my sixth rose star. I've made a vow not to make any more until I get the background stitched onto the other four. Then I'll do the backgrounds along with the stars themselves - otherwise having to do a whole fleet of backgrounds before I can sew them together will be a recipe for terminal procrastination!