I thought I'd lay out the duvet tonight and see how it looked. It's been one of those projects where the individual strips don't look great by themselves, so I needed some reassurance.
It does look a lot better all laid out. I was also able to find my missing brown piece...at least I didn't do the math incorrectly.
I wonder if it would look better in a different layout. The strips are currently in a repeating pattern from the left. I can't change the up and down stripes anymore, but the vertical stripes might look better if they radiate from the center.
Hmm, I 'm not sure. The left and right sides don't match each other, but I figure they'll be hanging off the side of the bed anyway. It's hand to keep that in mind when analyzing the pictures. I guess I'll send off the pictures to the intended recipient and see what they like the best.