To use it, head over to Martin Owens' blog an download it, extract the archive contents and navigate to "flips" folder and place 12 png images numbered "01.png ... 12.png" (from 01 to 12) and a title.png which is the title.
Then, make sure you have Inkscape installed. For Ubuntu:
sudo apt-get install inkscape
And finally, generate your calendar:
./create-cal.py 2010
./make-book.sh
You will find the generated png files in the "pngs" folder so everything is ready to be printed.
Of course, all the credits for this script go to Martin Owens.