Step back lunges: 4x10 each leg
Walking lunges with barbell: 4x8 back and forth, each leg
Straight leg deadlift: 4x10
One-legged lunges: 4x8 each leg
Side lunges: 4x8 each leg
Leg Press(machine): 4x12, feet high, push from heels, not toes
Wall squats-until failure with dumbbells in hand
This is just an example of what you can do! Reps and sets will vary on your goals, but this is a good starting point. Lift as heavy as possible while keeping proper form. Make sure you stay on your heels and don't push off your toes! You will engage your glutes through your heels! Really focus on squeezing your glutes in when you come back up. This will also engage your glute muscles, you'll start to really feel the burn. Don't fear the heavy weights, once again. If you want curves, LIFT HEAVY!