I'm thinking:

Aquatic
Modern
Elemental
Medieval/Royalty
Summer
"Mirrored" Classic (Popular NPCs would have opposite personalities, maybe a cloud raining upside down, etc.)
Nature

How about a Job Nexus
(Have Nurses, Business Guy, Etc)

Want

Anti aquatic af you guys.

How about a nature themed nexus with endangered species for mounts.
You could set a jungle room with trees, bushes and some other stuff.Another one in the savana, etc.

Or maybe a mayan/aztec nexus
Alot could be done, boxes/tables/chair/bench(etc) with special colors and symbols, a quetzoal mount, etc.

A aquatic nexus could be nice as well. Coral furniture, coral hats, sea animals hats,pets and mounts.

yeah NOT ENOUGH

-Weather Nexus
-Superhero/Villain Nexus
-Olympics Nexus
-Robot(ics) Nexus
-Circus or Carnival Nexus
-Time Travel Nexus(Historical events or just time periods)
-Mythological Nexus(Animals, monsters, etc.)
-Scientific Nexus

I think these could lead to some good, creative ideas.

Btw i dont know if it's still true but ive heard that Nexus was going to open once a year with different fairy tail from different country, the last one were from English autors

If that's the case I guess Club Crypt is our only hope.
Since revolutions has been(no offense) pretty bad compared to past years in content and quality(Sorry but there's no way I'm spending 5.5k gralats on a flower themed stuff).
Nexus feels kinda empty even though it's been pretty full the last few nexuses. That's probably just me though.
Also, nexus is supposed to be multi-themed, if it's just fairy tail, it's totally not multi-themed. We don't want to see the same kind of content all the time.

Weather nexus would be good, but there isn't that much to do.
Olympics.... Well maybe for furniture, but otherwise there isn't much to do.
I can see a Time travel & Mythological nexus though. Same for scientific & robotic nexus. Superhero could be fun, but hard with the copyrights issues.

Terrorist theme... maybe.

Whoa... just hit me....

Gaming Nexus.

Furniture ideas...
Dice (soccer ball, kick to roll 1-6)
Monopoly style mini-houses
Game pawns (typical or special)
Board 'tiles' for floors
Spinner wheel (interactive, spin for random output, 4 or 6 colored sections)
Letter blocks (think Boggle, Scrabble)
Card furniture set (with 4 suit "recolors")

Hat potentials are endless...
popomatic bubbles, colored pawns, chess pieces, rollin dice, cards, card-shark visors, numbered markers, monopoly style pieces, Clue pieces, timers/hourglasses, the list goes on...

Morphs... the little monopoly dog comes to mind.

Maybe a 'tic tac toe' "Game" to add to the folder with poor old RPS ?

Can this be a thing?

Still want a Nexus themed after iClassic history, like paying respect to certain players and guilds or reviving things that have since been removed from the game
Would offer a very wide away of themed content and would show staff are actually in touch with the community

Not sure how they'd do it, but it'd be cool
They should release a "SoN 10k hat" for sale, since Kate sucks

Yeah, those SoN guys could finally get some kind of reward that they towered for, before that selfish Kate held out on them and made all the towering mean nothing. Anyways, Classic history could be cool. Could even have themes from Graal's origins.

didnt we already have a nexus with the afro hats (maybe even spread across 2?)

there was a summer nexus a while back, made an ocean for my house boat using the towels that were blue and had fish on them

Science Fair