Starting a Striped Quilt

I have had my eye on this diagonal quilt for a while now.

 It's "pinned" on my Pinterest quilting board.

I've started cutting three inch fabric strips to make it, using scraps I have lying around...

But I was puzzled. With the wide range of colors in the quilt, how does it maintain a bluish hue? I photographed the photo, then printed it up. Studying it, I realized that solid blue strips are interspersed irregularly throughout the quilt - every three to five rows!

As I cut my multi-colored strips, I wonder - what background color should I add to bring it all together?

I'm not sure... I haven't decided yet!