Paint swatches are wonderful! You get them for free at the hardware store, and you can use them for craft projects, for example a colorful reminder of upcoming birthdays.

Step 1: Select Colors and Stamp

It’s easy as pie: use some large stamps (I used “Simply Sweet” foam stamps by Doodlebug Design) and black ink (Staz-On) and stamp the first three letters of the month on a card (I chose colors which resembled the mood/temperature of the months).

If you don't have stamps, simply use a sharpie =)

Step 2: Print, Cut, Glue and Arrange

Now attach a printed list of the days to the card. Use good glue, otherwise they might curl upwards after some months like mine did…
Anyway, if you’d like to make such a calendar - I attached a free download for you as a PDF :)
Print it (12 copies of page 1 or, to be correct, 7 copies of page one, 4 copies of page two, and 1 copy of page three) and cut it to the width of your paint swatches. Trim to get an equal height. Choose a nice place for your calendar and attach it to your wall or door.
I always mark the current date with a little arrow (“Book Dart”), so I can see upcoming birthdays at a glance.

birthdaycalendar.pdf
Download

Step 3: A Little Extra

By the way, the icing on the cake is the cat on top of my door. I cut it from vintage wallpaper scraps. And it covers a dent in the wall *g*.

Well, I hope you like this Instructable, and if you make such a calendar, feel free to send me your pics :)