Brainstorming, designing, decisions!

I'm working on another cathedral window quilt - same construction as my "Feel the Rainbow" Project Quilting piece from last week - - - but different design / colors.

I don't have fancy quilting software..... but I do have graph paper and colored pencils!

That's my design idea - - - but I just can't decide which side will be the back (squares & raw edges of the cathedral windows on the front) and which side will be the inside of the windows on the front.

Here are the piles of circles.....

Each stack is a side of the quilt.  But which will be the back?  The front?  Ahhhhhhhhhhhh.  I keep changing my mind!

So.... I will cut batting squares and go to sleep and think on it.  Hopefully I'll wake up to a decision!?

What are your thoughts?  Lighter fabrics for the "inside" of the windows on the front and dark fabrics for the back / raw edges?  Or vice-versa???

Help!!!

Hope you enjoyed the sneak peek at my latest creation - and I look forward to your input on the design.  I'm sewing this one up so I can write up a tutorial on the design / creation of these fun quilts! :)