As Alan Cohen author of "The Dragon Doesn't Live Here Anymore" says "The people who are successful are those who are grateful for everything they have."
A simple and powerful tool that a person will remember is by giving a positive feedback to another person. It is more than giving a compliments.
Be conscious what is going on your surrounding. Begin to notice what people are doing. Do not assume that people know they are being appreciated. If you see someone being helpful or doing a good job acknowledge and show that it is being appreciated.You can never overdue acknowledgment as long as you are sincere,it is given as a gift and it comes from the heart.
Giving is a form for sharing and receiving acknowledgment and it enhance and deepen the amount of trust and respect in a relationship.
Acknowledgment does not expect nothing in return.