1. Do some small nice things
    Pet a dog, open the door for people, leave change in the tip jar...
  2. Meditate, be mindful
    Meditate on whatever you want, meditate on nothing, focus your breathing. Be mindful of those around you, be mindful of your actions, what you say
  3. Leave some pennies head up for good luck
    Now you can't just buy your way into good karma, but I think that by leaving some pennies heads up to give others good luck in turns gives you good karma