In BBC's Sherlock series (Series 2 Episode 1, "A Scandal in Belgravia"),
Jim Moriarty says to Irene Adler: "If you have what you say you have, I'll make you rich. If you don't, I'll make you into shoes."
What does he mean?
Googling led me to a link that that is probably enlightening, but unfortunately, not for me.
So if this is a play on words, then what are the possible meanings?