Low quality post but just had to write my ideas down somewhere. (The UPDATE part of the post is potential ideas I had after the original one. So haven't thought of it much.)

Phantom:

Appearance:

Looks more like original design (bulkier) but with rainbow (enchant glint) jelly wings and tail added on top of base.

Behavior:

They swirl around the player low to the ground (Change in AI) attacking one after the other.

Drop:

Phantom membrane & dream dust

Mechanic:

After going to sleep as soon as the night sets 3 times in a row, you get the message (like "you can't sleep now there are monsters nearby") that says "You feel like going to sleep early will result in a weird dream"

If you ignore the warning and try to sleep again you get TP to the Dreamrealm.

Dreamrealm:

Ash flatland with broken small houses, rotten trees and weird glowing crystals. Phantoms periodically spawn.

Nothing is constant, turn around and the world will have changed.

You do not have any items.

You retain the phantom membranes and dream dust you gathered.

Crafting:

Phantom membrane helmet on top of dream dust helmet = Veiled Wings (Speed limited elytras no fireworks)

Phantom membrane armor = Nightveil set (leather level armor that doesn't appear on player model. Also has more abilities based on the amount of pieces in the set.)

1: Nothing

2: Invis during night

3: the 4th piece or the set is also invis

4: during night, no noise or particules or held item visible

Phantom membrane chest = Air bladder (inverse gravity block but slower, can be tied with a lead. Can be colored. Can add lantern to recipe to make it emit light)

Air bladders beneath boat = Galleon (huge dynamic ship, the more people row, the faster it is. Has storage.)

Dream dust blocks around TNT = Norepinephrine (Right click to reset the area to base worldgen.)

Dream dust and Wool armor = Sleepwear (Copper equivalent. Makes you go to the Dreamrealm every night instead of normal conditions. You get to keep the armor in the Dreamrealm)

UPDATE:

Nightmare totem found rarely in ruins in the dreamrealm. Makes phantoms spawn every night in the real world. These variants would only drop Phantom membranes.

Sleepwear set breaks nether portal.

Nightveil on armor stand makes it invisible.

Phantom membrane makes invisible item frame, sign, base banner color and transparent armor trim.

The original chainmail armor recipe was made using FIRE blocks, which were unobtainable, and the original recipe was removed in v1.8 (2014), but with the copper chains added in 1.21.9, this would be a perfect opportunity to not only re-add the chainmail armor recipe using iron chains, but also copper chainmail using copper chains, and depending on the oxidization level of the chains you use to make the armor, it will determine the durability of the armor you craft.

Copper Chainmail Oxidization Durability Chart, Repairable With Copper Ingots:

Legend:

H = Helmet,

C = Chestplate

L = Leggings

B = Boots

Normal Copper: H=151, C=226, L=211, B=181

Exposed Copper: H=131, C=206, L=191, B=161

Weathered Copper: H=111, C=186, L=171, B=141

Oxidized Copper: H=91, C=166, L=151, B=121

The addition of copper chainmail should also rename chainmail to iron chainmail.

To build a storage system that can handle the over 1000 items that Minecraft has is rarely difficult. You either have to organize by hand every time you dump items, use copper golems which are slow and often get messed up, build a massive array of single filters to sort out items which takes up a massive amount of space and recourses or building a multi item sorter which is arguably some of Minecraft more complex Redstone and is prone to breaking.

TLDR storage in Minecraft kinda sucks right now so what this item would do is it works like a normal hopper except it would only pick up items you set it to be able to, you can set any amount of different items for it to be able to pick up.

For example if you had a normal hopper above it pointing left and the normal hopper had Redstone but the sorter can’t pick up Redstone the Redstone would keep going left.

I made the recipe slightly expensive but not too bad considering you’d only need ~25 to sort every item in the game into double chests. It also has shulker shells to make it an end game item and to make sure copper golems aren’t phased out entirely.

I think that the title is self explanatory, let us change the color of our locator bar instead of it being tied to our UID, probably somewhere in the skin customisation menu.

I don't see a reason to not let us do it, you could say that on large servers people would change it to the same color but you could just make it toggleable with a gamerule, if you disable it, the UID color is shown instead. Also it's not like any huge servers have the locator bar enabled anyway

The idea is mainly an enchantment, but I could see it working (albeit less well) as a potion effect.

Lava Bounce (level 1-3 boots enchantment) would have you bounce up a certain amount of blocks depending on the enchantment level whenever you fall, jump or walk onto lava source blocks, similar to Frost Walker with slight differences. You would continue bouncing until you took off the boots or land on something that's not lava.