Mission Knitting: Afghan Growing Again

Recently I started working on the mission afghan again.  I have decided to make it 7 squares by 9 squares then extend it by using up other leftover yarn.  This is what it looks like today:

I am sorely tempted to turn them into garter stitch miters but know that the gauge, thus size of the squares, will be different, so, so far, I have restrained myself....