I just thought of a game idea where a tiny, tiny person is inside of a house, fighting off various things (think Chibi Robo/Pikmin). One of the weapons he'd have would be a toe nail clipping that he'd use like a boomerang.
I came up with this idea while clipping my toenails.
No, no, no. You did it wrong. If you were Miyamoto, you'd come up with a game inspired by clipping toenails. All you did was shrink Zelda. And even that's been done.
How about this: You live on a world that is constantly shifting. At one end of the world, new land is constantly rising out of the sea. At the other end, the old, dead land extends out into an empty void, but it is regularly and catastrophically sheared off by forces beyond your understanding. Your people are a curious case of stationary nomads, constantly picking up and moving everything while trying to stay near the sea, where the land is most productive. There is competition for the best land from different tribes.
At the other end of the world, there are treasures to be found near the edge of the void, but dangers as well. The dead land is full of fissures that can drop you into the void, as well as monsters, and you can never be sure just when the land will be suddenly sheared off into the void. That becomes more likely as it extends, but more treasure also appears. (The treasure and monsters represent the filth that collects under your nails.)
You are the leader of your tribe, and your job is to provide for your people. You have to balance the gathering of resources from the living land (like farm plots that yield less as they drift voidward, with the risk of losing whole harvests if the land dies), constant competition for the best locations (I'm thinking non-violent land grabs; you have to wait for more land to appear to build larger things, but the opponents might take the land earlier for something small if you wait), and, of course, equipping parties of adventurers to send into the dead land to find valuable treasure, hoping that they come home before another shearing.