Peruse the available paint brush colour options for each species of Neopet. (It's our own version of the Neopets Rainbow Pool.) You can even see a list of which ones haven't been released yet!
This colour combo has 2 Pet Styles available.
Apply this item in the Styling Chamber to your Koi to get this look:
Nostalgic Grey Koi
Released: January 23, 2024
Apply this item in the Styling Chamber to your Koi to get this look:
Somber Grey Koi
Released: August 15, 2025
The following biology parts can be removed with the appropriate Be-Gone! can (not applicable to Pet Styles).
Prior to April 2007's big revamp, Neopet colour combos were available in static poses, which you can see below:

Circle

Faded Circle

Happy

Sad

Angry

Sick

Petpage Photo

Close Attack, Left

Close Attack, Right

Ranged Attack, Left

Ranged Attack, Right

Defended, Left

Defended, Right

Hit, Left

Hit, Right
From April 26, 2007 through January 22, 2024, this Neopet had the following UC form available, which has been superceded by Pet Styles:
