This is another of my favorites for the simplicity and inexpensiveness of it! Take a plastic 4x6 photo frame (shown below). Typically less than $1 to purchase. Design a 4x6 insert and lay the frame down. Stick down a pad of post-it notes and wallah!
I used the CTMH Scholastic Paper Pack (X7159B), the Silver Metallics Marker (Z1768) and cut a square of the 12" x 12" Chalkboard Sheet (Z1789) to create the insert.
A first for me, this year I also added the "pen holder" by taking a piece of grosgrain ribbon and some red tape. I placed the red tape on the ribbon (approx 1.5"), then wrapped it tape side out around the pen leave 1/4" of the tape exposed so it can be adhered to the frame. This made the ribbon sturdier with the tape and ribbon layer, and the exposed tape was a quick and strong way to adhere it to the frame!