A simple tool that can turn my day around at any moment is making a list of things I am grateful for. The list can include material things that I own and things I have accomplished, but the most effective things to put on the list are spiritual things and things that I did nothing or little to have.
It can be the same list over and over with the same basic things, but it always works to turn my brain around from considering selfish, material things, to larger topics that involve me in a larger world. In this way it can be considered a form of prayer.
A great TED talk by Louie Schwartzberg.
"Open your heart to the incredible gifts that civilization gives to us. You flip a swith and there is electric light. You turn a faucet and there is warm water and cold water, and drinkable water. It's a gift that millions in the world will never experience."