Every year my sister-in-laws have what we call "Sister's Day". Each sister makes one gift to give to all the other sisters. In return, you get a gift. So this year I made 9 Birthday Card Organizers. They are actually very easy, but time consuming.
Using white envelopes, you place the month on the flap and the "calendar" for the month. Then you can place your cards into the envelope so they are ready to send when you need them. It is actually are great organizing idea.
I found this idea HERE and Pinned it on Pinterest.