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).
Feet Transient Biology
Removed by Feet Be-Gone!
Removed by Eyes Be-Gone!
Removed by Mouth Be-Gone!
This Neopet was not available in Unconverted (UC) form prior to Pet Styles being released.