Really quick back of the envelope calculation
(which does not include agonizing over maximizing every square centimeter of potential wasted fabric)
Cutting 2" squares out of a FQ
Assume usable FQ is 16"x20"
That's 80 squares from each FQ.
Figure out how many hexagons you need of each color for the star (and the layout you want to create within the star) and how many stars you'll need for a queen size.
The star in the pic you mentioned (very, very cool, btw) is 14 hexies across at its widest.
Is the 1.5" FINISHED measurement side to side or point to point?
If it's side to side (as placed in the picture), then each star would be around 21" across.
Note: the quilt in the pic is 48x48, so those hexies are much smaller than 1.5".
# hexies per color x # stars / 80 = # fat quarters per color
Don't forget to add in fabric for the border hexagons as well.
Last edited by MTS; 09-20-2012 at 08:24 AM.