I've been practicing this with a stone I found that is roughly the shape of a heart and it's an amazing exercise. I've been more upbeat than usual and I'm starting to love expressing gratitude for everything I have. And expressing gratitude or developing "An Attitude Of Gratitude" can bring you more happiness and success in life. (As these people have said ...)
"When you are grateful fear disappears and abundance appears."—Anthony Robbins
"Develop an attitude of gratitude, and give thanks for everything that happens to you, knowing that every step forward is a step toward achieving something bigger and better than your current situation."—Brian Tracy
If you haven't practiced this before then I highly recommend it. Because I think you're really going to enjoy it and that it will bring more success into your life. All you need is a nice stone or pebble that you can keep in your pocket. Give it a try and start expressing gratitude today.