Did you know that your glutes are the biggest muscle in the body and that in order for muscle to grow resistance needs to be applied. Weighted glute bridges are a great exercise to add to your list of exercises and the trick is once you're up there squeeze your butt like like you squeeze lime wedges Here I have 135lbs but you don't have to go as heavy but you can add some resistance to this.
Those big bouncy balls are a must have for both at home workouts and exercises at the gym. Study has shown that workouts performed on the ball are 30% more effective than floor exercises. Here is a list of 35 exercise ball workouts to work your whole body.