If your still looking for suggestions..
Try some lunges, lets say 3 sets of 2 minutes for each leg. After a week or so, add weight (hold dumbbells in your hand).
You can also do squat jumps, 3x12.
Plyo's were already suggested, but the way I do them is to jump onto a chair about 1.5 to 2 feet tall, jump off backwards (not far, just enough to clear the chair) and as soon as you hit the ground you jump up as high as you can. So its jump on, jump off, jump high, land, repeat.
Your legs should be beastly in no time