Divine Mercy Chaplet
Grab your rosary beads and pray the chaplet (instructions here).
Jesus gave the words of the Divine Mercy chaplet to Saint Faustina Kowalksa.
Jesus asked St. Faustina to have a painting of Himself made exactly as He appeared to the saint, with the why and red rays emanating from his heart which wash away people's sins. Miracles have been reported just by adoring Jesus while viewing this painting.