From Lisa Hendey's "Catholic Moments" blog, a link to the lovely "Prayer to Our Lady of the Smile" from the Catholic Doors Ministry.
Gentle Mary, My Mother,
I place before you the worries,
hurts and hopes of my heart.
They shrink my soul and I feel heavy and hopeless.
Darkness closes in around me.
I reach out to you, bright Lady of Hope.
Smile on me.
Smile on my loved ones and the intentions I place before you.
(Mention your intentions here...)
Your tender smile works miracles and heals,
as you did with St. Therese, the Little Flower.
You are my true Mother.
You show the tender mercy of God.
Smile on me, Blessed Mother,
and all will be well.