Upvote:1
The most colorful sutta is MN77 MahΔsakuludΔyisutta.
Not perceiving form internally, someone sees visions externally, blue, with blue color, blue hue, and blue tint.
Not perceiving form internally, someone sees visions externally that are yellow, with yellow color, yellow hue, and yellow tint
Not perceiving form internally, someone sees visions externally that are red, with red color, red hue, and red tint.
Not perceiving form internally, someone sees visions externally that are white, with white color, white hue, and white tint.
(etc.)
AN10.29 is the second most colorful sutta.
Upvote:1
There is what is termed the Fire Kasina which is mentioned in the path of purification or Visuddhimagga.
There's a fascinating site where people document there experiences with many types of mental visualisations.