Seven-Coloured Rasengan

The Seven-Colored Rasengan is a Rasengan, colored by the light reflecting from mirror generator in the Land of Snow. This coloring gave the chakra used for the Rasengan the appearance of a rainbow. Judging by how far it causes the opponent to fly, it may be that the multicolored chakra is not just a colorful sight, but somehow increases its power as well.

Trivia

 * This technique is also shown in one of the Naruto opening themes, Re:member (Opening 8).