I got tired of finding unneeded lights on so we developed a penalty piggy bank for offenders in the family. Every time someone leaves a light on (that they no longer need,) and another family member notices, they have to put a nickel in the piggy bank (I have young children, you could use a dime, a quarter or whatever penalty you want.)
For the littlest member of the family, I gave him permission to turn off the light switches if they are on and no one is using them. Through this, we have increased the energy awareness in our household and I find far fewer lights left on. Because they have to pay it from their allowance, they seem to get the point a lot quicker.
By Selena