One concept that some are experimenting with is Smashketball, utilising the Level Editor in the Wii U version. As you can see in the diagram below, the idea is to structure barrels, platforms and lava in a very particular way.
The players start off on the main platform, and the aim is to achieve quick kills by forcing opponents into the barrels at the side pointing down. There are potential options for salvation with lava to affect those that get above the barrels, and a moving platform and additional barrels below to save those that fall. It adds a new sense of strategy, as you can see in the video below.
As pointed out on Kotaku, players are using social networks to share a variety of designs and adjustments to this Smashketball concept, as the game itself doesn't allow easy sharing; the absence of that feature — we suspect — may be to avoid mature stage shapes and types from flooding the game. That's unfortunate, but fans find a way.
As a fun extra, Kotaku also shared a video of Smash Potato a few months ago with the release of the portable version, in which two players select the Villager and essentially try to pass the tree back and forth, psyching the other out to miss and be pushed off stage. There's some swearing in this video — so be warned — but it's pretty entertaining to watch.
Beyond simply beating the snot out of each other, have you and your fellow players found any quirky ways to play Smash Bros. on Wii U or 3DS?