Flowers and Ribbons: Find an assortments of floral vintage dresses that are similar but not exactly the same. Then add different color ribbons onto each dress to differentiate them even more. (via Naughty Shorts)
Casual wedding party - different prints on the dresses (Phillip doesn't love the colors here, and is nervous about patterns getting too complicated. but we liked how these are casual, and depending on the print, that could be fine.