if the Walmart washcloth ''is'' the color you DIL likes, then by all means, have HER buy it ( that way she is to blame if the color isn't right when the quilt is finished!!! ) and carry it with you to purchase the cotton fabric. When you get into ''naming'' a color, every one sees color a little different.....you have blue/green teal and green/blue teal!!!!! I just finished a quilt for a friend who likes ''teal''......until I took her into a fabric store, she had NO IDEA of the wide range of teal colors there are. Don't go by the color name......buy that washcloth and use it.....lay it out on the open bolt of fabric and stand back to see the colors. Buying on line is a gamble, as far as color choices go......sometimes you get ''lucky'' and other times.....well, it's more fabric for the stash!!!!