Perhaps you have some gratitude prayers from your own religious tradition. If not or you are more secular in philosophy, here are a couple to consider for a daily practice from the Robert Emmon book, Thanks! How the New Science of Gratitude Can Make You Happier.

From Garrison Keillor, Prairie Home Companion
Thank you, Lord for giving me the wherewithal not to fix a half-pound cheeseburger right now and to eat a stalk of celery instead. Thank you for the wonderful son and the amazing daughter and the smart sexy wife and grandkids…Thank you for the odd delight of being sixty, part of which is the sheer relief of not being fifty. I could go on and on…List your blessings and you will walk through those gates of thanksgiving and into the fields of joy.

Native American tradition
We thank Great Spirit for the resources that made this food possible;
we thank the Earth Mother for producing it,
and we thank all those who labored to bring it to us.
May the Wholesomeness of the food before us,
bring out the Wholeness of the Spirit within us.

Thich Nhat Hanh, Buddhist teacher
Waking up this morning, I see the blue sky.
I join my hands in thanks
for the many wonders of life;
for having twenty-four brand-new hours before me.