Nothing says summertime fun better than a rainbow! If you're planning a fun party this summer, these rainbow birthday party ideas might be just what you need! I know I'm excited and my 6-year-old twins are sure to have a colorful day! Fantastic Rainbow Birthday Party Ideas Kids Will Love Your kids will love these fun and colorful ideas that include food, decor, and games! 1. Make this cool Surprise Rainbow Party Invitations. The party guests will love it when they open them. 2. Have the…