3x3 will come out at 69" square, if you do that second 4 square border past the star points. I am not doing that border so mine should come out at 63" square, unless I add a small border before I bind it. That's a fine size for me.
I keep looking at the colors and just don't feel happy. The green just disappears in the quilt. I like yellow, just not with pink and purple. It looks like a white, pink/purple, and yellow quilt to me. I think I may skip the yellow since we haven't cut it yet, and just use some more green, at least for the big squares she has you cutting in 4's. I can't think of any other color to sub that will work there and make me happy. I'll keep thinking on it, tho.