If you want to tone, you will need to incorporate strength training, resistance training, or any kind of weight-lifting into your routine. As Michele above me mentioned, cardio helps you shed calories and won't be effective in creating a toned look. Any fitness model you see has a strength training routine in their exercise regimen.

are you talking 2 hours of cardio a day?! That's a lot! I agree with the others, do some weight training. When you do cardio, you burn calories, mainly while you're actually working out; but when you weight train, you burn while you're working out AND after because your body is building muscle which takes energy (calories), so you're actually revving up your metabolism for a couple of days!! AND adding shape/tone to your body, so you don't just look skinny, you'll look FIT!
But warning.... don't obsess with the scale if you start doing some weight training because muscle weighs more than fat. You can actually lose fat and gain "weight" because muscle is made up of mostly water.