Graph Paper.

Do you draft out your own quilt designs?  How about playing with layouts and colour options for your latest hexie quilt?  This website has free graph paper in all sorts of different shapes and sizes - you can download and keep a PDF of your most used shape.  There's diamonds, triangles, hexagons and squares of course.  You set the size you want and off you go.

 (Images from http://incompetech.com)