Really cute & bright!! Your extra squares could be used in the border, or on the back of the quilt. It is always good to have lots of blocks to choose from.
Oh, how cute. So far I'm in love with that porcupine and that squirrel. I wouldn't have noticed the zig zag if you hadn't mentioned it. But, you're right...with some thought about color placement that would be pretty cool. I'm usually too lazy to think too much about color placement.