I really really like LayerVault's style a lot and there's no doubt that Flat-UI is influenced by it, but it's not as if LV created this in a vaccuum. Dribbble

I really really like LayerVault's style a lot and there's no doubt that Flat-UI is influenced by it, but it's not as if LV created this in a vaccuum. Dribbble (which is my main way of watching design trends) has had this stuff pretty common over the past three years. They look visually similar. As well as dozens of other pieces/sites.