Where do new ideas come from?

New ideas come from our brain's inspirations. Every person's brain is thinking of new ideas at every single second we live. Whether it is as simple as a new combination of foods, such as ketchup with rice, or as complicated as the next great invention that would change mankind. We are all creating new ideas. From where though? Where are we getting these new ideas that can be both meaningless or valuable? There are many reasons our brain has created such ideas. They could be our past, present, future, from our home, relatives, knowledge, loved ones or even strangers. The point is, all of our ideas have inspirations and thoughts linked to them that caused them to be created.