I made a book corner bookmark (with those very nice instructions) with my boys this weekend. I like this origami method because it uses a small square, no fancy shapes or templates. The fun part for me was selecting an interesting bit of "paper" - I like how the Hershey's Special Dark cocoa label looks as a bookmark. The fun part for them was using a white envelope corner, and coloring it to suit themselves. In fact, coloring was so much fun, we never got around to the monster inspiration!