Oh, my goodness you made this hard!
I decided on a simple pattern that I could utilize my fat quarters. I would have bought 1/2 yards if I had thought more carefully, but this pattern does pretty good.
I'm using
http://www.villarosadesigns.com/shop...-x16567970.htm
I will be using the darkest purple some of you recommended for the rails and the binding.
That is unless I change my mind and go with the triangles. If I do the triangles, I will still use the dark purple for the background.