Mismatched colour pop groomsmen modern ushers haha oh god could happen
Gray and black as the neutrals, and then color matched shoes, bouquets and bouts for the wedding party.
Wedding Magazine - Wedding moodboard: rainbow ideas for your celebration
Rainbow bridesmaid dresses white on bottom
Technicolor Nails: Photo by Christine Farah via Green Wedding Shoes
All Things Rainbow : Cakes Gallery
Could achieve similar look with hanging balloons! The Hanging Lantern Company - hanging paper lanterns and other pretty products to help you style and decorate your wedding day
rainbow origami and lights. such a cheap centerpiece idea but so cool. ombre maybe? I wouldn't do the rainbow but I love the idea.