I emailed Nadia this morning to ask how big she wanted the blocks to be and for confirmation that it was "stitcher's choice." She asked me to pass along her response to you all.
Nadia emailed me back to say "let's do 12" blocks" and....drumroll please....that she gave birth to baby Gus yesterday! Hello Gus!
The blocks are stitcher's choice, but if you read Nadia's post you'll get some good hints on what appeals to the new mom.