Sorry but since I'm not so familiar with NFTs, can you explain a bit what do you mean? What features can you add or create? Are you talking about their appearance or about their usage? Again, I'm sorry if I sound like noob.

Probably some tokens with some unique features that users can buy, sell or even win through different games or bonuses. I don't know if there will be a marketplace of sorts to facilitate trades. The problem with NFTs is mostly based on demand. If no one is willing to buy at your listed price, then you stay with the token for good