I am personally making this post, because I really want to see this happen I have added a few of my ideass
Hey everyone. If you are reading this right now, do take a look at my avatar. She's Alice (Yes. That Alice who visited Wonderland) from Rage of Bahamut. Earlier this year, I participated in a same project, only to find that the project manager disappeared (Not logging on for months, and quit) after 2 days. I was so sad, hoping for this mod to happen. Well, let me explain the mod idea.
New dimension, which is The Wonderland (or was it Underworld?), only accessible through specific portal (like an End Portal in a Stronghold). A Gigantic tree, which only spawn at a certain location within a range from your spawn. Under it, there's lots of rabbits spawning. In order to find the portal, you have to scurry through the roots, jump into it, and BAM!
You had just reached the beginning of the Wonderland, a small room which nothing can be broken, and a tiny door at one end. At the center of the room, a table with a cake on top of it. Eat a slice and you'll shrink (Like Gulliver's mod), just enough for you to fit through the door.
Soldiers of Hearts
Soldiers of The Queen of Hearts. Only spawn in or near a Castle of Hearts. Attacks you and Soldiers of Spades on sight. They're very thin (A card.) so it's easy to beat them with water. Damage is based on their number on their body.
Queen of Hearts
One of the two bosses in this dimension. Has a ranged attack and Regeneration II for 5 seconds every 1 minute. Only spawns in the Throne Room of a Castle of Hearts. Also, wields a staff with a Heart on top of it which sometimes shoots explosive hearts that only damages entities.
Soldiers of Spades
Soldiers of The King of Spades. Only spawn in or near a Castle of Spades. Attacks you and Soldiers of Hearts on sight. Like Soldiers of Hearts, they're cards. Damage is based on their number on their body.
King of Spades
The second boss (Depends on which one you met first) of the dimension. Has a Melee attack and deals Wither II to you for 5 seconds once every 1 minute. Wields a Black Sword and wears Diamond Armor.
P.S.: He's actually Herobrine. Surprised? Well, he got bored of terrorizing Steve and became king instead.
Very annoying. When he's around, you will hear strange singing and Nausea will kick in after a short while if you don't kill him quickly. Only spawns on trees, and only one can exist at the same time.
A small boss. Breaths fire and flings you very far away with it's melee attack.
All sorts of other strange stuffs
A dense forest, worse than a roofed forest. When you are in it's vicinity, you get blindness. ( Biomes o Plenty dark forest affect, Cheshire cat can spawn there- Unique darkness)
A path made of gravel. Leads you to nowhere and soon, you will find yourself lost.
Edit Unique Darkness: Maze
The maze would be surround my hedges leading to the red or white Queen's castle.
Castle of Hearts
Large castle, made of red pink ad white wool, pink stained glasses, and pink stained clay. Contains loots.
Castle of Spades
Pretty much a crossover between a horror movie and a Nether Fortress. Made of nether rack, nether bricks, black stuffs and heads. Surrounded by a river of lava.
Garden of Hearts
In front of a Castle of Hearts. Roses grow everywhere and a thick hedge made of leaves formed a labyrinth.
A rare spawn. Inside contains loots and a single Jabberwocky, which breaths fire and flings you far away like an Ender Dragon.
( Edit Unique Darkness) Tea Table: The tea area where the mad hatter, and everyone else sat.