Stained-glass look in quilt

Here is a twin size that is a great way to get rid of all those left-over strips of material from years of other projects with edges, sashs, etc. I grouped them in color piles and then sewed them together into a square and diagonal cut the finished square. Add a black diagonal cut square to the other half and you are on your way to a quilt that has a stained glass look. Can you see my error in the layout of the squares???