I've had luck with tea-dying or coffee-dying some of my "close enough" fabrics to get an aged look. Not sure if this is what you're after, tho! An artist friend who does fabric painting and dying has had very good luck with a weak bleach and dye solution that pasteled (is that a word???) every deep colored fabric she soaked in it. But that could be tricky, I'm sure! Another good website is Keepsake Quilting. They've a good selection of 30's fabric and their customer service is wonderfully helpful. I also found a site called www.fabricattic.com that had both 30's and feedsack on-line, but I haven't ordered from them before. Good luck in your search!