Rainbow Crepe Streamers and Balloons. Birthday Direct has awesome colors and cheap prices here to mimic this look: http://www.birthdaydirect.com/solid-color-crepe-paper-streamers-c-45_209.html http://www.birthdaydirect.com/solid-color-latex-balloons-c-252_239.html
A rainbow art themed birthday party. This is a super fun idea, especially if the party needs to be indoors. The birthday cake is amazing! I want to learn how to spread the frosting so it drips like that.