(Inspiration) This is a fun wedding cake design! 4 tiers, 2 simple with fondant bows and 2 tiers absolutely covered in a rainbow of sprinkles! We've also done something similar before - great for a modern wedding theme.
Rainbow Mini Cakes All in White or ivory would be a cool idea! Okay, so not in these colors but
Anti-Gravity Cake: She looks pretty nervous about making that first cut. One wrong move and that top cake ball is going straight onto Grandma’s head. (via Rainbow Sugarcraft)
Rainbow Rose Cake- maybe just with wedding colors