get some canvas shoes (they're very cheap), and paint it black, but paint the rubber part at the bottom teal. then find some dark black thigh-high socks (the ones that don't have the raised bits, they're smooth. i know they make them because i have some myself) and you can add detailing at the top of the socks if you like.
it should cost about $15 total.
edit: here's a pair.
they're even in black already!