I had these chip board letters lying around that I got from the Target $ bins. I spray painted them all red.
Number your 15 blocks 1-15 on the bottom.
I painted mine a latte' color and then
distressed the edges with brown paint
I laid out the letters on each block according to the cheat sheet I have (I can get you a copy if requested)
and then I decorated away. All the other versions I have seen were just letters stamped on the wood, but I wanted it to be more of a vocal point on my mantle, so I added a little flair.
The final product!