Playing with clay is one way to do that-and it's astonishingly comforting to revert to childhood and play with play dough or other forms of clay. Just the act of rolling the smooth clay or dough into a snack and manipulating it can be quite soothing if you are having a rough day.
The Bible citation that jumps to mind when talking about clay is Isaiah 64:8 "We are the clay, you are the potter; we are all the work of thy hand." God molds us, according to Isaiah, like the potter does the clay. In playing and praying with clay, we have the opportunity to be creators, too.
How do you pray with clay? First you need clay or play dough. You can even make your own if you don't happen to have children or grandchildren handy with a supply you can use. Here's a recipe I used with my children. You can find more at: http://www.playdoughrecipe.com.
Salt Dough
1 cup of salt
1 cup of water
2 cups of flour
1 tablespoon of cooking oil
Food coloring (optional)
Mix all the ingredients
together. Knead the mixture until it’s doughy. Divide into balls and knead food color in if you want. Keep it wrapped in plastic as it will harden in the air. (It's probably edible, but probably yucky.)
Now that you have your play dough or clay, you can take colored lumps of it and form shapes of things you are thankful for-a new baby or a house or other blessing.
You can shape the lump into something that represents how you are feeling. Maybe a rainbow if you are joyful or a cup if you feel that you need filled up with the Spirit.
As I said at the beginning, sometimes it is therapeutic to just manipulate the clay and let your mind roam. God hears the thoughts of our hearts whether we are able to articulate them or not.