I'll add something that could be interesting. Now this is more or less a bigger feature than given up to now in this topic.
Nxt Auction House.
In fact, an auction house would be a mix between the Nxt marketplace and AE. Indeed, AE fee to create an asset are too high to do such kind of thing and marketplace do not allows bidding on item. Overall, I think Nxt has most necessary code to do such a thing.
As a use case, this AH could be used to trade virtual in-game items in gaming platform. I'm sure a cryptocurrency auction house could attract some niche people also in other markets (for example, you know what Mt gox was before being a cryptoexchange haha
The way I see it, is that someone would be able to create a prunable asset where anyone or a whitelist could bid on it. Once time-out is achieved, the largest bidder would be contact by the issuer to do an exchange in a similiar fashion as in the Nxt marketplace. Probably people would like to used escrow, but eventually that would result in the creation of a market or trustable escrow around the Nxt ecosystem, which certainly be a good thing.
Also, check out this older topic on this subject:https://nxtforum.org/general-discussion/nxt-auction-system/
Don't be shy to post your idea.