PODness Fun with Books of Hours II
It occurs to me that making a prayerbook would be a good activity for Catholic schoolkids or homeschoolers. You could print out a copy of some prayers or one of the offices (unless the kids really needed a lot of penmanship practice chunked into many days). Then you could have the kids decorate the margins however they wished, and draw big pictures at the beginning of major sections. (You could leave pages blank for this.) Finally, you could have the kids make a cover for the book out of cloth, wallpaper samples, etc., then bind the pages into the cover. Voila -- a prayerbook of their very own!
Naturally, you could also associate all sorts of subjects with this activity: religion (obviously), history of languages, art history, European history, economics, the Church Year...you name it.