Power/Energy-saving lights? If you have custom-made speaker/boom boxes you can use materials that are recycled.
It would be very inconvenient, I think, if you are running around with all those solar panels since you are mobile. But if some of your equipment can run on industrial grade rechargeable batteries, perhaps that's where the solar panels come in. You recharge them batteries at home/office during the day. Maybe you can save energy this way. Well this is just an idea. Just my 2 cents... hehe