Using one of the few "traditional" styles of Karate, Kyoushikin, Lyoto Machida has become a force in MMA.
Here are some great examples of the techniques that we learned in days gone bye and how an exceptionally gifted practitioner uses them in combat.
Front leg foot sweep:
vs BJ Penn
Back leg foot sweep:
vs Vernon White
"Magic" kick (that is what we called it in TKD):
Double motion round Kick: