Here's an alternate thought.... I'm thinking the dark blue sashing shown as is might steal focus from the trip-around-the-world blocks. I'd try the sashing size your displaying only made up of three narrower strips (a dark blue strip between two strips of the fabric you used for the butterfly wings.) Then I'd try out a wide border of the dark blue fabric.

I like the dark blue. Remember to orient the butterflies correctly before you sew it all together.

I really like the blue.

I like the blue...

The darker blue of course.

The darker blue - absolutely. The butterflies are great and it's a lovely quilt.

I like the blue best too.

Hope you pick the blue!

The blue

I like the yellow on the left. It makes you eye go directly to the center of the quilt, the design. I also like the blue on the right. It would be my second choice, though.

I do not like either of the top or bottom ones. They are not dynamic enough to complement the quilt itself.