You will need:
Two Blocks 3.5x3.5
One Block 3.5x7.25
Black Vinyl or other way of putting letters and numbers on the blocks
First sand and paint your blocks. I knew that I wanted to use red scrapbook paper on my blocks, so I painted them green to start. Then cut your scrapbook paper to be slightly smaller than the block I cut my paper to be 3x3 for my 3.5 inch blocks. When the paint it dry, Mod Podge all 12 sides of your smaller blocks with your paper. You can use all different papers, or the same one. Then on one long side of the big block Mod Podge a piece of scrapbook paper, the size of my paper was 6.75x3.
Then you adhere the vinyl with the words "Days 'till Christmas" on the big block and the numbers on the other. The numbers 0,1,2,7,8,9 need to go on one block. Use a 9 that can be doubled as a six. The numbers 0, 1, 2, 3, 4, 5 need to go on the other block and you will be able to do all of the days left until Christmas starting on the first day of December (and some days before.) I used numbers that were about 2 inches high and letters that were about 1 inch high at the tallest point of the capital D.
There you have it, a cute, simple advent calendar to count down the days until Christmas with.