I like the dust ruffles idea also. If you can't find any brown one, here is how I have made my dust ruffles.
1) I get decorator fabric (light weight) and use my serger (or sewing machine) to make a ruffle in the width I like (2 to 1 or 3 to 1 ratio).
2) And I do this way the most- I buy 2 king flat sheets and cut strips in the height that I need and ruffle that fabric. I buy cheap sheets because they seem to have just the amount of body that hangs nicely.
I have done the double ruffle by making one out of a printed sheet fabric and attaching that to the quilt, and then bought sheet or fabric in a solid color for the dust ruffle that goes on the bottom mattress.
karen