First, thank you to everyone who responded to my earlier thread asking for opinions on sashing for these blocks for a wall hanging. I really appreciate it! And since so many people suggested purple, I finally decided to heck with it, I'd go get a purple to see how it did. (I used a coupon, and my niece's nursery is purple, so I figured I could always use it for her as a last resort.) Here are my 3 options, though I have to say that I'm really leaning toward the purple now.
I retook the pictures of the green and white fabrics, so that they all looked similar.