The decision to make a Cookies & Cream biome involved more than just me liking cookies and icecream (doesn't just about everyone?), but I looked at the Hallow and saw it as a dreamy world full of pixies, unicorns, and trees that reminded me of the ones from the many stories of Dr. Seuss. At first glance it may seem like a "good," safe biome, but soon enough the player finds out that everything there wants to murderize them.
The Hallow is a deceptive biome, just as its painting calls it "The Land of Deceiving Looks" if I remember correctly. Taking this concept, I thought what else could follow the dreaminess of the Hallow? Candy Land was an obvious choice, as it also can be a land of deception (and if you ask me, makes more sense than the Hallow.) The Hallow attacks you.. just because, but the Confection enemies attacking you is somewhat symbolic of how sweets may look appealing but can be harmful for your health (HP).
The Candy Land idea has been suggested before, so I felt instead I should try a Cookies & Cream biome, as it is also a land of sweets but a little more original, as well as having more theme as Candy land is open to EVERYTHING sweet and being more generic, I think. Limiting myself to just Cookies & Cream still let me have a few things to work with: icecream, cream, cookies, icecream toppings, cherries, and bananas. I did use a few more candy-themed ideas like Sweety Gummies, Gummy Worms, and Rock Candy, but I have plans to see about turning these closer to the Cookies & Cream idea.
I feel the Confection follows the Hallow's concept a little more closely than the Cyber for the above reasons. I have nothing against
@Zoomo 's Cyber, just it's not really a deceiving world is all. I could see it easily working as another Corruption alternate, especially seeing how it's a biome lacking in color, as opposed to the Hallow's colorful rainbows. I can just imagine some kind of vents acting as chasms that lead down to protected hard drives that are shadow orbs or something. The Cyber could be thought as a computer virus that wants to consume all. That's just how I see it though, working better as a Corruption alt than a Hallow alt.
That's how I came up with the Confection. It was much more than what I'd find as an interesting biome, but something that resembles the Hallow without being the Hallow. I see both the Corruption and Crimson being nightmarish places, with the Hallow and Confection being more dreamy (though also nightmarish). I hope those who find this biome ridiculous can understand my thought process and possibly change their minds to support, but if not, I understand.