Hey there!
I would like to share a proposition of adding the addon items to the server - not the addons themselves just the items. I haven't been playing real tibia for years so I don't know how many of these were there, but I'm speaking about the series of items that were added in including the addon system to the game (feathers, cloths, iron ore etc).

For me personally it was a great addition to the game, monsters that normally didn't drop anything made you to stop for a second to check the loot, that adds that little excitement/hope for looting something not just run through a monster like it's just a background not a part of the game.
The other reason for adding those to the game is that for me, some of them were just simply good looking items - I loved to decorate my house with heaven blossoms for example. The clothes were also seen very often as the deco.

I think that this is not a game changer but an improvement that could make the game a little bit more interesting. Some of the addon items wouldn't be obviously available because there are no creatures that drop them, some could be changed like an apes fur could be a wolf or bear fur instead of paws.

Some of you may think it is not worth doing that only for a decos, so here's my another idea!
As we do not have Ankrahmun, nor Port Hope we are a little bit short on the colourful backpacks :( (which are great for segregation)
This could be a perfect usage of the addon items actually - custom made backpacks . We could have a mission like "A Sweaty Hugo" that would give us some missions in order to receive a design (like a dress pattern) for a certain backpack that could require addon items to be made obviously after doing a mission.

This could be just a visual thing or it even could have some effects for example:
- some elvish bag/backpack that could only store food and could be bit lighter
- dwarvish/miners backpack with some steel ferrule that would be heavier but it could have special 4 slots for rope/shovel/pick or some equipment stuff
- some bag/backpacks for rings/amulets only
if you have any other ideas please also share, that could be interesting.

So here's my idea or even two ideas. I don't think that brings much changes into the gameplay itself, it does make the game a little bit more interesting? Maybe I'm wrong, maybe people are playing here only for the full oldschool and don't want to see such changes, or maybe it would take to much effort to implement, but this is  why I made this thread - please share your opinion on that.