you might want to check out the fabric line by Blank called Shade Cascade. it would be perfect for this quilt design.
its by karen combs and it has 4 shades of the color across the width of the fabric.
here's a link to the fabric line and if you go to quiltshops.com and type shade cascade sale into the search box you'll find the online shops that have it on sale
http://www.blankquilting.com/NewestC...llections.aspx