As others have mentioned, it is very difficult to make any block that is made up of three section. Hence most 9 patch pattern will be 3", 4.5", 6", 7.5", 9" or 12" in size. It is one of the short comings of charm squares. You might go look thru charm square patterns if you don't want to waste too much of the fabric:
https://www.google.com/search?q=char...w=1024&bih=622