I think it's a good idea and can see where you're coming from. Yes it's 'chavvy', yes it's over the top, but they won't be on all the time and it's a nice modification if done well.
I'd like to see what advice comes from this thread as it would have a lot of 'shock factor'. For £17 it's worth a go. After all, cable ties are easily removed and the car is returned to normal.