I want to share a link for all kinds of graph paper - http://incompetech.com
there is a ton of other stuff on this website, but I was looking for hexagon graph paper and this website has a graph paper generator that will produce a pdf file in any size grid you need for whatever you need any kind of graph paper for in metric or inches. There's also circle, perspective, tiles, tumbling blocks, etc. What a find!
There is a mesmerizing assortment of goodies on this site, so don't say I didn't warn you.