At the moment I'm thinking of a Bishi Bashi (look it up) style party minigame collection for up to four players but where everyone only needs to use one button that they assign for themselves. The gimmick is that everyone can either use their own controller or share a single one (I'm even thinking of maybe having a seperate mode that suddenly re-assigns buttons between minigames, giving it a feel somewhere between Warioware and Twister).
The goal is to be as accessible as possible not just to newcomers of the medium, but also to those who are less able than some (colourblindness, illiteracy, wheelchair using etc.) and yet still contain enough variety and hidden depth to excite and engage. (Neo-Nazis not being much fans of openness and inclusivity, see *wink-wink*)