Commandment 1: Thou shalt cook at home instead of eating out.

Commandment 2: Thou shalt not buy a new vehicle if you can make do with an old one.

Commandment 3: Thou shalt switch off the lights, fan, TV etc when you exit the room.

Commandment 4: Thou shalt not pay for services that you are fit and healthy to do on your own.

Commandment 5: Thou shalt not pay full price for any item that will eventually be available on sale. Thou shalt not pay anything at all for what can be had for free through nature or public offerings.

Commandment 6: Thou shalt not covet thy neighbor Joneses belongings.

Commandment 7: Thou shalt not waste – be it money, leftovers or time.

Commandment 8: Thou shalt entertain yourself through inexpensive means.

Commandment 9: Thou shalt live by the 3 R’s – Reduce, Reuse or Recycle.

Commandment 10: Thou shalt not confuse frugality with cheapness.

Update: Thanks to Matt's comment below, I have decided to add an eleventh commandment to my list.

Commandment 11: Thou shalt not buy something when its clearly a want rather than a need.