What block did you have in mind?
Were you planning to use sashing between the blocks?
Were you planning on adding borders?
Are the blocks you have in mind easy to downsize?
Some of the 3 x 3 grid blocks are easy to down size to 10.5 or 9 inch square blocks.
Some of the 4 x 4 grid blocks can be downsized to 10 inch or 8 inch blocks fairly easily.