In the bathroom:
Years ago I found clear shower curtains, I have been using them since. I don't have a light in my shower and I don't have a glass shower door because I an in an apartment. The connection with lowering your eletric bill is this:
With a clear (not translucent) shower curtain, you need less light for when you shower, therefore you can use lower wattage lighitng. I'm really sensitive to light, but I find most people use way more than they really need. I'm not sure if they are just used to being in overlit envroments. my small bathroom is lit by a 2.5 watt CF bulb and a 1.3 watt LED bulb. Yes, that's it. But really, it's plenty of light.