Icon for Purple Series tools
An example of an atmosphere colored with Grape Flavored Sky
An example of land colored with Purple Terra-Coloring
An example of water colored with Grape Juice Ocean
This is the Purple Series of planet coloring tools.
The Grape Flavored Sky colors the sky Purple.
The Purple Terra-Coloring colors the land Purple.
The Grape Juice Ocean colors the water Purple.
Acquiring
Three of them (Skies of Red, Purple Terra-Coloring, and Deep Blue Sea) will be given to you automatically if you choose the "I want to paint planets" mission from your homeworld.
The rest are found the same way as artifacts: by visiting a planet with yellow radar waves coming out of it, using the radar to locate the item, and then using your Abduction Beam to acquire it. They have the same appearance as terrasculpting tools, so you can't be sure what you will get.