Good question.
Borrowing, stealing, … experience, etc… however you want to put it represent a small fraction of the creative process. Consider it like steroids. It can boost the process but lacks the longevity to step it up. The downside of such dependency is long term drought of ideas.
The key to any creative process is to shut down reception from the outside world and listen and communicate to your self. Now, this is not about good or bad art, nor about high or low quality, but it’s about a creative process that its outcome is representative of YOU. I second the fellow who recommended to go out experience a lot of things, since that could help not only the visual memory, but will certainly enhance your recognition of potential ideas.
Don’t take me wrong, shutting down your reception could take fraction of a second, or hours. The key is to connect to your self.
lol…I don’t know why I feel like a Yoga instructor 

