It might look better to use it as a boarder, instead of dividing the main fabric.

I agree about the blue.
I think the purple goes best as it is a soft purple and does not take your eye away from the main fabric as the red/orange does in my opinion.

I vote for the orange!

The orange or the purple.

orange.

The top fabric in the picture draws my eye

purple all the way

Top and middle fabric would work great. No blue.