You can make them square but you could also use sashing and keep them hexagon. This Kaye Wood's video shows you how to put sashing around hexagon blocks. Of course, she is touting her ruler in it but you could easiyl do it without.
http://www.youtube.com/watch?v=_f0-wcJXVx0
here is a link to a thread here on QB that used hexagons
http://www.quiltingboard.com/pictures-f5/amy-butlers-sexy-hexy-love-quilt-t39495.html
and here is a link to the pattern
http://www.kikiquilts.com/index.php?...roducts_id=784
Hope this helps.