It's a colour wash!

I've been playing with these colourwash string sets made for me last summer by members of the 15 minute play bee. Originally, I was going to set them with lime green sashing between the strips, which are of varying length, but are all 6 inches wide. They move from orange/pink to blue. If I don't use sashing strips, the quilt will be smaller, but I have lots of lime green for borders. I'd welcome suggestions or ideas on how to put these together.