Turn off the lights when you exit a room. Simply turning off the lights when you aren't using them can really save energy. You also have the added benefit of saving money on your power bill.
If you live in a sunny area, you could generate your own energy. Invest in PV cells and have a professional install them on your roof. You should have your needs in electricity assessed by a professional to make sure your solar installation will provide enough power for your home.
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Swap your old thermostat for a greener programmable model. You can program these thermostats to adjust the temperature at particular times during the day, so your heating and cooling system will run less while you are at work or school. These thermostats are inexpensive, and they can save you money on your electric bill while preventing unnecessary energy use.