The first one I made at Stamp Club had chipboard coasters as the covers (so it could be a desktop time-keeping device). I wanted to be able to hang this on a refrigerator, so all the pages are card stock, some with designer paper, stickers, seasonal stamps, and computer printed clip art images.
I got to use my beloved Cropodile to punch the holes. I used a hefty piece of silver stretchy elastic cord (recycled off of a Christmas gift) then fed the ends through a barrel bead and super glued the puppy.
Oh, the mini-calendar pages were generated using the program that can be found here http://www.red-castle.com/software/fw/printcal.htm