1. Keep a Gratitude Journal. Write daily about what you are grateful for. Try not to write the same thing everyday, explore your gratefulness.
2. Remember the bad--the contrast may encourage gratefulness.
3. Ask yourself 3 questions. Choose a person that you know. Consider what you have received from them, what you've given them, and what trouble you may have caused them. This may lead to discovering that you owe others more than you thought.
4. Pray. A ritualized form of giving thanks may help increase gratitude.
5. Use your senses. 80% of people say that they are thankful for their health. If you are in that number, then use your five senses to see, hear, smell, taste, and touch the world.
6. Use visual aids. You may need a note to yourself to remind you to be thankful.
7. Swear an oath to be more grateful. Promise on whatever you hold holy that you'll be more grateful.
8. Think grateful thoughts.
9. Acting grateful is being grateful.
10. Be grateful to your enemies. It's a huge step to be thankful to those that you most despise. But this is just the kind of thing to set off a change in yourself.
--as adapted from PsyBlog