Themes are a feature for those who have reached 10,000 CPS. They can be used to change themes to make the game enjoyable.

Theme how to get Description Abilities Secret? Hint
Normal Free The standard theme you know and love!
Halloween Change bakery name to Halloween This is Halloween, this is Halloween.
Thanksgiving Change your bakery name to Thanksgiving Gobble gobble.
Christmas Change bakery name to Christmas Santa Claus is coming to town!
Easter Change bakery name to Easter Have you found any Easter eggs? Egg hunting.
Cat change bakery name to cat. A lovable cat to look at when you get bored. Not a dog.
Spring change bakery name to spring Feel fresh and clean with this breezy spring theme. April showers bring May flowers.
Ninja mgg Change bakery name to ninja Watch out! Cookie Ninjas might strike in the middle of the night! In CCC1, the secret will unlock called 'Small Oven' when the midnight strike, Shuriken
Clown Change bakery name to Clown The least scary clown you'll ever see! Supposed to be funny.
Blueprint Change bakery name to Blueprint Pull out your pencils and lets [sic] draw a cookie! Technical drawing
Valentine Change bakery name to Valentine From us to you. Enjoy our homemade heart-shaped cookies! In the middle of February.
Invisible Change bakery name to Invisible We're not sure why you'd want to use this theme - but we've got it! Makes the cookies invisible You can’t see me
Invisible Dark Change bakery name to darkness A dark version of the regular Invisible theme! Makes the cookies invisible. This is advanced ________.
Astronaut Change bakery name to Neil Armstrong Always pack lots of delicious cookies for the long journey ahead. One small step.
Birthday Change bakery name to Birthday Enjoy some black forest cake! When were you born?
Knight Change bakery name to Knight Defend your cookie kingdom with fearsome knights!
Pirate Change bakery name to Pirate Did you know the skull and crossbones is called the Jolly Roger? Look how educational Cookie Collector is!
School Change bakery name to school Apples taste good, but cookies that are shaped like Apples taste even better! Get an education.
Ancient Egypt Change bakery name to Pharaoh Who know cookies from Ancient Egypt were still safe to eat! Ancient egypt.
Leprechaun Change bakery name to Patrick Feeling lucky? No, this is _______.
Candy Change bakery name to candy If you've played the original Cookie Collector, you'll know all about these (including the time it took to get thousands of them). Same as CCC1, but it no longer be effected. Crush them lor eat thwm
Alien 500 Million/

Change bakery name to Alien (CC2)

If it's made of dough, we can eat it. Yes (CCC1 only)
Phantom Change bakery name to Phantom These spooky spirits wander the cookieverse. Of the opera.
Racecar Driver Change bakery name to Stig Some say he spends all his winnings on cookies.

All we know is, he's called the Racecar Driver.

All we know is...
Witch Change bakery name to Witch She cooks up magical potions that can turn you into a cookie. Watch out! Of the west.
Superhero change bakery name to superhero It's a bird, it's a plane, it's COOKIEMAN! It’s a bird, it’s a plane.
Dinosaur Change bakery name to littlefoot RAWRRRR! In Version 1.2 and earliest, this gets a 0.01% CPS Boost. But this version, no longer get a boost. The land before we could tell time.
Monster change bakery name to monster Check your closet. Drinks, wires, and cats.
Doge Change bakery name to dog. Much cookies. Such amaze. Very taste. Gives a Doge conversations to the game. Not a cat.
Turny (from Land Sliders) Change bakery name to Land Sliders Our friends made an awesome game called Land Sliders! Check it out on the App Store! Made by Prettygreat.
Team Blue Change bakery name to Mystic Articuno (a Pokémon) Blue, Red and Yellow are teams from Pokemon GO
Team Red Change bakery name to Valor Moltres (a Pokémon) Blue, Red and Yellow are teams from Pokemon GO
Team Yellow Change bakery name to Instinct Zapdos (a Pokémon) Blue, Red and Yellow are teams from Pokemon GO
Silly Shake your device during a Rainbow Cookie Storm. Have fun with cookies flying all over the place! Hint: It's fun to shake things when it pours.
Special Cat Change your bakery name to "Tap here to name.". What an unusual looking cat. Hint: Tap here to name.
Emoji Tap the "Weird Stats Tapped" Stat