Apple have a similar scheme in the early 90s with Mac, but the novelty wore off.
There is something better than computer is to remember to turn off any unused lights, uses efficient light bulbs, take shower with shower saving head instead of bath, and turn off water between usage.
Turn down the hot water tank, heat, air-condition a notch (every 2C lower will save 30% in energy), seal the chimney flu in the winter (you will save up to %40 of energy, from of heat lost due to draft & heat rises), replace single panel windows with double panel, and make sure the house doesn?t have any cracks.