There is only that much matter and if you look at the periodic table of elements, only so many combinations.
Really??? Why is the human being so arrogant in thinking he knows everything in the universe? Are you saying that there are no more elements because they are not in the Periodic Table? Think twice, please.
And to think there is an limited amount of possibilities is to be pretty closed minded.
Edit: Of ocurse, you have a limited life but that is something else.