This design was inspired both by 4volt's Hex toy and this Bonsai Calendar [ http://www.notcot.org/post/26450 ]
I really liked the idea of a calendar desk toy, and thought there was something really nice about the idea of building with time, so this construction toy calendar came about.
What I really like is that at the end of 2010, there's no need to throw out this calendar. Instead, a new calendar for 2011 (and so forth) can be cut, and used with the previous year's to build bigger and better creations.
The included files are designed for 1/8th inch thick plywood. I really recommend plywood over, say acrylic, because of the really tight tolerances. Wood has some flex & elasticity to it, whereas more rigid materials have a tendency to snap. (Thus ruining your month.) (Yes, I have a tendency to pun, my gEarings should have given you that indication.)
The file includes 2 colors of line, cut the red (the hex shape), etch the black (the text).
Assemble, and enjoy.
Don't forget to reassemble it each month so that the current month is on top.