The concept of counting your blessings can sound trite, if not handled carefully. So I hope I can do the concept of gratitude justice.
I know that an authentic feeling of gratitude can’t be faked. The order of the principles (Anger, Worry, Gratitude) has relevance. If we are angry or worried, it’s hard to be satisfied with our lot. If we have genuine concerns about money or feel anger because we feel we have less than we are entitled to, a feeling of gratitude just isn’t going to happen.
Sometimes we need a change of attitude to feel gratitude. A lack of gratitude, of always wanting and never getting, brings us down emotionally as well as physically. Gratitude can be an uplifting experience; we can hold ourselves tall, knowing that we are satisfied with what we have, or have the skills to obtain what we need.

Recently, after waking up to several dull and grey mornings in a row, I was truly grateful for a burst of sunshine when it happened.
Spring is a time for gratitude; witness the new buds forming on trees, crocuses and daffodils popping up everywhere. Better times ahead, summer is coming.

I grow tomatoes and herbs in the garden and buy a pot of basil or parsley from the supermarket. I say thank you to the plant before I take what I need. From a spiritual/shamanic perspective, I am expressing gratitude for the Earth’s bounty. We can also say thank you after a self-treatment, to show gratitude.
Another Reiki principle that can help with gratitude is ‘Be kind to all living things’ An act of kindness can help restore another person’s faith in human nature.

From Penelope Quest: Reiki For Life: The Complete Guide to Reiki Practice for levels 1, 2 & 3

Be grateful/ show appreciation/ count your blessings We need to value and appreciate many things in our lives and to be grateful for our many blessings; however, sometimes we need to recognise those blessings first, because if life is a struggle and if we are going through a ‘bad patch’, this colours our view of life until we assume that everything in life is bad. Even when we are happy and healthy we are often not aware of it and take it very much for granted. Yet most of us are living very good lives, even if they aren’t perfect. Take time out of every day just to stand and stare at the beauty of a flower or the happiness of a child at play. Develop an awareness of life and what it means to live it. Of course there will be ups and downs, happiness and sadness, but every experience is valuable because it helps to make you who you are. So, just for today give thanks for your many blessings. The world is a wonderful place in which to live a physical life, so use Reiki and meditation to help you to develop an ‘attitude of gratitude’ to discover and trust in the abundance of the Universe and to develop your own belief in your deservingness of love, beauty, peace and anything else you need or desire.