An Original Idea?

The Bible says "there's nothing new under the sun".  Wow!  Isn't that the truth!  It seems like every movie or book is a rip-off of some other movie or book.  My husband and I joke about this all the time but it is really daunting when you are trying to write creatively and be entertaining without being "cheezy" or thought unimaginative.  Every time I think I have on original idea, I realize that it is influenced (sometimes heavily) by someone else's idea that I saw or read or heard somewhere.  Maybe that's what people call "inspiration" but I so badly want to have a purely original idea for a story.  Tonight, I think, once again, that I may have one.  I can see how it was inspired by certain things but very vaguely.  I may not be able to get a novel out of it but surely a television episode at least!  Hm...now that's an interesting idea all it's own....