Let's see:
I've made this pattern before in 6.5" and in 12.5", but I can't find the pattern for the 6.5" for now.
I did find the pattern for the 12.5" and the Pattern is called "Cracker" so you may want to google that later, but read the directions on the pattern because one section makes the 1/4 block.
The 6.5" blocks look really cute in 30s colors.
The 12.5" block is at this link for quilters cache.
Here goes:
http://www.quilterscache.com/C/CrackerBlock.html