Rainbowically

To colorize items, in the colors of the rainbow.

My grocery list has been colorized rainbowically.

Rainbowically by Poppy11 May 23, 2018

rainberically 

Expressed or sorted in the order of the colors of the rainbow.

I arranged my closet rainberically so I can easily find the right color shirt.

rainberically by JackSmithson December 19, 2010

Rainbowetically

When something is arranged by color, following the order of the rainbow.

Sometimes a result of Obsessive Compulsive Disorder.

David felt compelled to arrange his collection of rubber ducks rainbowetically; starting with red, and ending with violet.

Rainbowetically by babblingbob January 30, 2010