Divine Mercy Chaplet
Through the Chaplet you will obtain everything if what you ask for is compatible with My Will (Diary 1731) 

Whoever will pray this Chaplet will receive great Mercy at the hour of death.

If this Chaplet is prayed in the presence of the dying I will stand between My Father and the dying person, not as the Just Judge but as the Merciful Saviour (Diary 1541)

Priests will recommend this Chaplet to sinners as the last hope of salvation. Even the most hardened sinner if he were to recite this Chaplet but once he would receive grace from My infinite Mercy (Diary 687)

I desire to grant unimaginable graces to the souls that will trust in My Mercy (Diary 687)

Encourage all souls to say this Chaplet which I have given you (Diary 1541)
Background Information

The Divine Mercy Message

Seven Secrets

St. Faustina

Let go of the Past

Start Again

Divine Mercy Image
Paint an image according to the pattern you see, with the signature: Jesus I trust in You. I desire that this image be venerated, first in your chapel, and then throughout the world. (Diary 47) 

I promise that the soul that will venerate this image will not perish. I also promise victory over its enemies already here on earth, especially at the hour of death. I myself will defend it as My own glory. (Diary 48) 

I am offering people a vessel with which they are to keep coming for graces to the fountain of mercy. That vessel is this image with the signature "Jesus, I trust in You." (Diary 327) 

The two rays denote Blood and Water. the pale ray stands for the Water which makes souls righteous_ _ _These rays shield souls from the wrath of My Father. Happy is the one who dwell in their shelter, for the just hand of God shall not lay hold of him. (Diary 299)
Divine Mercy Hour
At three o'clock, implore My mercy, especially for sinners; and, if only for a brief moment, immerse yourself in My Passion, particularly in My abandonment at the moment of agony. This is the hour of great mercy ... In this hour I will refuse nothing to the soul that makes a request of Me in virtue of My Passion. (Diary 1320)

When you say this prayer, with a contrite heart and with faith on behalf of some sinner, I will give them the grace of conversion. This is the prayer: "O Blood and Water, which gushed forth from the Heart of Jesus as a fount of Mercy for us, I trust in You." (Diary 186-187)

As often as you hear the clock strike the third hour immerse yourself completely in My mercy, adoring and glorifying it, invoke it's omnipotence for the whole world, and particularly for poor sinners, for at that moment mercy was opened wide for every soul. In this hour you can obtain everything for yourself and for others for the asking. (Diary 1572)

Divine Mercy Feast
On one occasion, I heard these words: My daughter, tell the whole world about My Inconceivable mercy. I desire that the Feast of Mercy be a refuge and shelter for all souls, and especially for poor sinners. On that day the very depths of My tender mercy are open. I pour out a whole ocean of graces upon those souls who approach the fount of My mercy. The soul that will go to Confession and receive Holy Communion shall obtain complete forgiveness of sins and punishment. On that day all the divine floodgates through which grace flow are opened. Diary(699) 

I want to grant complete pardon to the souls that will go to confession and receive Holy Communion on the Feast of My Mercy (Diary 1109)

(The Feast of Divine Mercy is on the first Sunday after Easter, therefore the obligation to go to confession does not have to be fulfilled on that specific day, but reasonably close to it. Saint Faustina herself attended confession the day before.)
Divine Mercy Novena

Day One

Day Two

Day Three

Day Four

Day Five

Day Six

Day Seven

Day Eight

Day Nine