Ideas for future trading post items

What ideas do you think the trading post can come up with in the future.

For me besides buying items that directly give you cosmetic items to add, I think it could work as a place where you could buy items that give you visual updates to spells.

For example, maybe you purchase an item for a monk that leads you on this globe-trotting adventure that has you look for this legendary master that teaches a specific type of martial art, and after learning this you get unique spell animations to your attacks, instead of looking kung-fu based maybe it would be ninjitsu or keysi, or whatever.

The idea is that in terms of concepts I think the trading post can be so much more than it has been so far.

Does anyone have other ideas that the trading post can do?