I typically look for 3 colors and favor dark red, black, dark brown, orange and yellow blends for my wood bows, depending on the colors of the limb glass and riser woods, and olive, black and bronze blends for my camo'd bows. Most trad hunting bows are 52-66 inches, which covers everything but the super magnums and the target bows, so that translates to strings 48-63". Good luck with your booth! If your string making jig is portable, I would definitely set it up and make strings at your booth, even if they are not customer-specific, so folks can see your material and workmanship quality.