Guild Wars 2

DandySlayer.7019:

1.) Add unique Weapons and Armor skins to dungeons that are not available to purchase from vendors.
Give people another reason to run the dungeon and add life to dead dungeons!

They already have this. You buy them with dungeon tokens. Each dungeon has their own vendor.

DandySlayer.7019:

2.) Add a bunch of cool skins that you can only purchase from the Gem Store that can not be obtained in game.
A better way to generate money then forcing people to buy gems to convert to gold due to a kitten Diminishing Returns system!

They also have this…

DandySlayer.7019:

3.) Also throw some skins you can only obtain by exploring the world and completing maps! Like have the Tyrian Explorer Society gift you a special unique set of armor or town clothes for getting 100% Map Completion!
Give people another reason to explore other than getting free exotics and the Gift of Exploration!

You also get these. Additionally Legendaries must have map completion in order to get as well.

DandySlayer.7019:

4.) All those useless Karma vendors in the cities could sell unique karma armor and weapon skins not found in the world or other cities! Like 2 or 3 sets spread through out the individual cities. These skins would be race specific like cultural armor but with out the cost and not as BAMF.
Give people a reason to go back to their home cities other than going to the bank or story quests. The cities are beautiful yet so empty!!!! That is SO wrong!

They also have these..

DandySlayer.7019:

6.) It’d be neat if when your crafting that we could choose different skins for our crafted gear via different mixtures of materials to allow for more diverse armors and weapons from crafters instead of the same stuff we’ve seen already!
Make crafting more than just a requirement for that legendary! Make it fun to discover new stuff!

Not sure what game you’ve been playing. This is also integrated. =_=’’ Practically every single one of these suggestions is already implemented.