Well, forty nine, at least.
After a number of false starts on the alternate block I came up with this one, so I made a few of them and laid out what I had on the floor. Pleased with the result, I sewed up a few of them and then resumed work on the main blocks.
That's when I discovered that with 49 separate little squares in a block there were oh so many ways you could get them turned and tumbled and end up with a mess. Oh so, many ways. All the little blue arrows are supposed to point toward the center but it is very easy to rotate one when you pick it up and then it's rip, rip, rip.
Has anyone seen this block before or did I actually invent it? It looks like a super augmented Shoo Fly block. I think I'm going to call it "Fly Away Home", The little blue triangles are like homing pigeons all converging on the brown square in the center of the block, their roost.