I'm in grade 7 and i have to do a science project on how to save energy...heeelp!!! :(?

K, so i already have a power point done but i reeally want a very good mark so i was thinking about making a little card board house and having a bunch of seperate rooms in it. This house will be of major energy wasters like leaving lights on,leaving TV on...etc. Do you think that could get me a good mark? If you have any ideas then pleeease help!! thanks :)