Syr, if you haven't, please read from here down until it goes off topic () and leave any thoughts you might have, that would be wonderful.
Seriously though whatever suits your fancy, Fish.
I was contemplating LED's and power switches as well.
There is the mundane and straightforward approach, like So.
Or perhaps a more DIY variant:
Another option would be a permanent switch like This, or This (available in Red, Blue, Green or Amber).