What kind of excercise makes your legs look good?
Walking fast is good, there is less stress on your joints than running. If you work out with weights, squats & leg presses will both help develop muscle & tone your legs.
Running makes them lean and also toned if that's what you're going for. :) ever since I've started running mine have become more toned and lean.
do a palates work out
progressives, High Knees, and cartwheels