Just repeating what Dee said below......do NOT close any accounts!! Doing so will lower your score. Just let them sit there, and don't use them.
By doing that, you are showing that you are able to responsibly manage your available credit, and not run it up too high.
In addition, do not run out and buy any big ticket items.............it may be tempting to open an account at Best Buy and order that big screen tv you've had your eye on, but any recent large purchases, when trying to buy a home, can negatively impact your ability to qualify for, and close on the loan.