Even if you can't match the blue exactly, I think a cotton print that has white and blue close to it would be my first choice. Of course it would help if it was all wedding-y and such. Can you describe the shade something that is close? I have a fairly large piece of white background wedding fabric that has a couple of colors of blue but they are sort of time specific too -- but since it is wedding related probably good enough. How big of a piece would you be needing?