A queen bed is 60" wide so if you want the star to just be on top, you'll need the finished HSTs to be 7 1/2" because the star is 8 blocks wide. Then you can add borders for the drop - more on the ends, of course. Or you can use 11" blocks and the star will extend over the edges and won't need a border on the sides.
http://www.quiltfrog.com/fourhour.html
I put a braided border on mine. Let me know if you want the link.