You will need:
Piece of wood (you can choose the size)
Spray paint or paint
Make your birthday calendar as unique as possible and use the colors you like! You can even use this idea as an anniversary board or memory board, were you ‘dot-down’ places you have been together.
For the full Monty, take a look on Christiney's cool blog: http://christineyscrafts.blogspot.com/2012/01/family-birthday-chart.html?m=1