I love the colors you chose, I would make 9 patch blocks around several large iris flower prints with a small green inner border, wider green/purple border and a purple binding, using the rest with maybe 2-3 inch 9 inch stripes for the back. Make sense??
check out this one, almost the same colors.
http://www.ebay.com/itm/PINK-PURPLE-...item4841783ca4