Offer your fiance's groomsmen a range of tie colors so they don't look too matchy-matchy. Pick different shades in the same color family -- from vibrant red to soft peach, for instance. That way the group appears coordinated, but each guy looks unique.
Elite Solids neckties in Christmas red, poinsettia red, burnt orange, ecru, and pale peach; Ties.com. Brooks Brothers French-cuff dress shirt.