I am looking for a shoe insert of some sort that will help me fill my shoes. My shoes are too BIG!?

I bought a pair of heeled boots, but i got a size too big, these were a fab buy in the sale, so couldnt resist. I bought a full size insole, but this dosnt really work, any ideas? I have been told you can get some sort of pad for the toe end? I really need something that will push my foot back.