Corinne of so september blog is churning out tons of ideas for embellishing blank fabric calendars, such as the one shown here (available from her SeptemberHouse Etsy shop). For example,
5. Sew on clear vinyl squares or rectangles edged with bias tape. Leave an open spot on one side to slide in photos. Then your calendar can change with the seasons and be personalized as well.
And
16. Turn your calendar into a fun diversion: Stitch on a piece of felt then cut out a variety of felt shapes: Mini felt board!
I want to try everything! Go see the whole list.