Advent Calendar - you can use note cards or envelopes tied together with a ribbon. Place something fun to do, scripture, notes of encouragement, or candy in them. Then just hang it somewhere. I like it because it's small!
Backing piece is a little larger to have room for a bigger tree=22x36 inches. Also a double layer for the back to hide my stitches and give the whole thing a bit more weight. After it's done, sew two layers together.