Here is a frugal craft you can make with last years calenders!
Take an envelope and gently take it apart. Lay it out on a piece of cardboard and trace around it.
Cut it out. Now you have a form for future!
Take your cardboard cut out and place it on the picture of a calender. Trace around it and cut it out.
Fold, making the dates the inside, and glue the envelope in the right places and there you go!
I think these really dress up a letter!