This is something I have thought about making for many years and only just got around to it. I have never been able to find a purchasable calendar with boxes big enough to contain all the things I want to record. Sure I could get a blackberry or an ipod and type all my notes into the entries for the particular days, but I am old school and I am very accustomed to pen and paper and seeing the whole month at a time on the wall.
Another great thing about this is there are no "slashie" days. As if you can only do half as many things on those days because they are inconvenient for the typical calendar format. If the month takes 6 rows instead of 5, then it gets six rows!
The attached images will print 12" x 28".
I've also attached the mtc files for those, like me, who are into that. You can use these to cut/print a larger version on cardstock with a vinyl/craft cutter.
Note: I would have made this a photo instructable, except that format will not allow you to attach other types of files, like the mtc files. cheers!