I think it would be a neat Idea to have the option to have trade chests. These chests will be just like trading, you can seek your payment through diamonds or any other desired materials. There could be many uses for this, exchanging different colors of a block or anything. (Just an example) I can set up a chest where you can put in a diamond block for 5 gold blocks. I think there could be uses for this that could add something extra to a shop or set up a new style of shop.