Clear the last style by clicking the Default Style button, and apply the Copper Tube and Negative styles to get the result shown below.

Below, I used the Brushed Metal style with the Negative style. If you compare this to the Brushed Metal style alone, you’ll find them very similar since there is little color in the Brushed Metal style. I like the Negative one better, though.
     Copper Tube and Brushed Metal proved the easiest to get good combinations from in my experiments. Fat Chrome is also useful.
     I couldn’t do anything at all with the Color Target, Rainbow, and Red with Gradient Stroke styles. The rest are worth a try. Remember to try applying them in different orders.