I love those blocks. You said the black lines are seams, and would not show in the final quilt. They do look like stained glass, but it will look very nice without the black lines, also.
I can see that there are only two different color layouts. Could you change some of the fabrics so that it's not so noticeable that the blocks in each column are the same. Some are upside down, but I would change blocks from one column to the other to make it look more like each block is unique.
And I agree with callen (and some others) that the background fabric is too busy. A more subtle, not so "printy" fabric would be better here. IMHO
Good luck on making your quilt. It will be beautiful.