I`m rather late to this and have been tagged three times but off the top of my head and as the rules exclude prayers from the liturgy I would say:
a) the Rosary,
b) May He support us all the day long, till the shades lengthen and the evening comes, and the busy world is hushed, and the fever of life is over, and our work is done. Then in His mercy may He give us a safe lodging, and a holy rest and peace at the last. (I always use this at funerals in the OF at the end of the bidding prayers.)
c) My Lord and my God, I firmly believe that you are here, that you see me, that you hear me. I adore you with profound reverence; I beg your pardon for my sins and the grace to spend this time of prayer fruitfully. My immaculate Mother, St Joseph, my father and lord, my guardian angel, intercede for me.