If an idea comes from your brain, and you haven't looked at or compared or copied anyone else's work in order to conceive that idea, then guess what -- that's an original idea. What usually happens though is we get all excited, think the idea is brilliant, and then we Google it like a crazy person and our hearts sink when we see something similar has been done before. But here's the thing: The fact that someone has created this before doesn't mean your idea isn't original.
New ideas need to be held in sacred hands. They need incubation. They need good wishes and time to be able to learn to breathe on their own. New ideas are about gut feelings, intuitive and mysterious processes. So don't rush the process, let your ideas grow and take your time.