printable asvent calandar takes 3 pieces of paper, the tree top, bottom and number ornaments. http://printables4kids.com/printable-countdown-to-christmas-advent-calendar/
kaboose.com has a cute Santa's beard one also. Children color Santa and add cottonballs to his beard as the days pass.
It is the most enjoyable one. children used to play games like cut and join pictures and making coloured pictures or changing the colours of the images it just advises them to think more and more.