It took me forever and cutting many more squares (and several more mistakes that had to be scrapped), but I fixed the quilt - well, that little part where the purple didn't match. The red still runs down the middle, which I suppose might just have been fate since it's looking amazing. Here's an updated photo of how the quilt is coming along:
So the red diagonal - looks amazing, doesn't it? I have sixteen of the purple and red squares and 16 cream colored ones. I have to sew them all together into squares like this - and then I have 8 blue squares, and 4 sparkly purple (like the ones that are the same size as the red), and 2 giant teal ones. And the backing is going to be the same purple as the 2nd smallest squares. I hope that makes sense...
Had the quilt been for me, I would have sewn in the square with the mistake, but this is for my brother and he's a perfectionist. BUT, I have sent him this photo already and he is impressed. So I'm happy.
Back to the sewing machine...
Anyone have any ideas for tying off the quilt? I would like to use beads down the middle, but I don't know if my brother will approve.