Missouri Star Quilt company has half hexy templates in 2 sizes. One uses jelly rolls (or 2 1/2" strips)
http://www.youtube.com/watch?v=F7c1ewoQV24
The other one uses layer cakes (or 10" squares)
http://www.youtube.com/watch?v=sC6Vr2k5yrM
I have both templates but havent' used them yet!!