To see all the colours that a Neopet species comes in, select that pet and hit 'Submit':

Acara Aisha Blumaroo Bori Bruce Buzz Chia Chomby Cybunny Draik Elephante Eyrie Flotsam Gelert Gnorbu Grarrl Grundo Hissi Ixi Jetsam JubJub Kacheek Kau Kiko Koi Korbat Kougra Krawk Kyrii Lenny Lupe Lutari Meerca Moehog Mynci Nimmo Ogrin Peophin Poogle Pteri Quiggle Ruki Scorchio Shoyru Skeith Slushie Chia Techo Tonu Tuskaninny Uni Usul Wocky Xweetok Yurble Zafara

To see all the Neopet species that come in a colour, select that colour and hit 'Submit':

Alien Angel Apple Asparagus Aubergine Avocado Baby Biscuit Black Blue Blueberry Brown Camouflage Candy Carrot Checkered Chocolate Chokato Christmas Clay Cloud Coconut Coffee Custard Darigan Desert Disco Durian Electric Faerie Fire Garlic Ghost Glass Glowing Gold Gooseberry Grape Green Grey Halloween Ice Invisible Island Jelly Juppie Swirl Lemon Lime Mallow Maraquan MSP Mutant Onion Orange Pea Peach Pear Pepper Pineapple Pink Pirate Plum Plushie Polkadot Purple Quigukiboy Quigukigirl Rainbow Red Robot Royalboy Royalgirl Shadow Silver Sketch Skunk Snot Snow Speckled Split Sponge Spotted Starry Stone Strawberry Striped Thornberry Tomato Tyrannian Usukiboy Usukigirl Valentine White Yellow Zombie