We really like copywork and I have just discovered a new way to introduce it for the week. Every child loves puzzles in my experience and while wandering around the web today looking for fun things to do in the month of December I ran across this cryptogram creator.
There is the option to type your own phrase or use one of the themes provided for you. On the next screen you can select whether or not you want them to crack the cryptogram on their own or give hints to the puzzle or the solution itself and the student just fills in the letter. It can be as easy or challenging as you choose to make it.