I primarily use a thrusting Thai style variation known as a "teep" and it has many different applications. One of my favorite ways to deliver it is to do an inside crescent kick but to drop it forward to a push kick/teep to the chin/face. Another flashy way to do a kakato geri which I never could do but have had try to be taught to me is to bring your leg up like an axe kick than come down and drop forward with the heel to the face.
Another fun way to annoy your opponent is to pinch the gi top with your toes and pull them into you while kicking a few times..try to see how much you can do it without putting your leg down
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