all meta decks were homebrew at one point, they are just better homebrews than whatever you want to do.
I'm not sure this is true. What are the meta decks right now? They weren't discovered after the expansion was released. They were all immediately obvious once the cards were revealed. Sure, someone "made" them first, but we all made Beast Druid, Big Warrior, Spell mage, Stealth Rogue in our head the moment we saw the new cards. It didn't require any stroke of brilliance on anyone's part.
There was a time when new decks were regularly discovered for months after an expansion. The meta shifted with some regularity. Now, the meta is more of less set within the first week, and it stays stable until the nerfs come. The cards are both powerful and obvious, so it's tough to be creative.