I make custom Formats and Modes for Hearthstone, my goal is to convince Team 5 to put at least one of my ideas into the game.
Here's the initial post I made, which started my endeavor -> Six Formats Hearthstone could Easily Have
The first Concept I made, which really even isn't on that list is Tournament Mode.
The second one, which could really be used in the game, is Explorer, A Custom Hearthstone Format.
The third is known as Tables, A Way to Play Hearthstone With Your Own Rules.
Full Art Cards, A New Hearthstone reward was made because Hearthstone, in general, needs more rewards and incentives.
After I finished all those above, I decided to stop. Simply because I have nothing else to offer.