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!
The following biology parts can be removed with the appropriate Be-Gone! can (not applicable to Pet Styles).
Wings Transient Biology
Removed by Wings Be-Gone!
Eyes
Removed by Eyes Be-Gone!
Mouth
Removed by Mouth Be-Gone!
Hair Front
Removed by Hair Be-Gone!
Head Transient Biology
Removed by Antenna & Horns Be-Gone!
Head Drippings
Removed by Drippings Be-Gone!
This Neopet was not available in Unconverted (UC) form prior to Pet Styles being released.