A Leopard Can't Change His Spots:
You cannot change who you are.
A Penny Saved Is A Penny Earned:
By not spending money, you are saving money (little by little).
A Picture Paints a Thousand Words:
A visual presentation is far more descriptive than words.
A Piece of Cake:
A task that can be accomplished very easily.
A Slap on the Wrist:
A very mild punishment.
A Taste Of Your Own Medicine:
When you are mistreated the same way you mistreat others.
A Toss-Up:
A result that is still unclear and can go either way.
Actions Speak Louder Than Words:
It's better to actually do something than just talk about it.
Add Fuel To The Fire:
Whenever something is done to make a bad situation even worse than it is.
Against The Clock:
Rushed and short on time.