Twelve more blocks would make a square quilt 72 x 72 w/o borders and 84 inches square with borders. In working out the layout so the pattern was even I wasn't paying attention to the dimensions. I am now rethinking the whole thing.
So this is where I am now. I took it off the wall and stacked it up 3 stacks of 4 sets of blocks each. I pinned them and stuck a piece of masking tape on the top of each group so I would get them up back in order in case I want them as they are. If I make more blocks I want them to be interspersed with the ones I have already as I am going to use some other blue/purple blue green family fabrics for the diagonal squares and I won't want them all in the same place. If I make this a large quilt I will also want to quilt it in sections.
This is getting complicated; I really like this palette but I don't want another big quilt and if I did I probably wouldn't use these colors. So...... I am stopping here and putting this on hold until I decide what to do.