“Really cool ideas” is subjective.
What are really cool ideas that you see get shut down on the WoW forums?
The ability to purchase in-game gear through the store?
More Night Elf / Blood Elf customizations?
Fourth, Fifth, Tenth specs for classes?
To remove all addons from the game?
To make it against the rules to decline someone from a group listing?
Oh look, here is one plucked from the forum right now: