Forms of Art Therapy
The most obvious art intervention in reducing test anxiety is the practical act of participating in an art-based activity, or art therapy.
Traditional art therapy is often used hand in hand with verbal communication, but it has proven to be just as effective by simply expressing oneself through art with no verbal communication at all. Not only does concentrating on completing a piece of artwork help give the angst-ridden student something else to think about, but art also helps to calm as well as to reconcile any emotional conflicts. It has also been shown to be advantageous in "promoting self-awareness and personal growth" (Ballou, 1995).
Let the students express themselves in whichever way they wish, as long as they aren't being noisy or affecting another student's concentration. Be on hand to deal with any issues that may arise, as art can open up channels of communication.
The type of art you let the pupils indulge in can vary from simple painting to pottery. You don't need a potter's wheel or anything fancy, even creating something from polymer clay is an artistic diversion. Collage is an often overlooked area of creative expression that those who "can't draw" might like to focus on.
You may also wish to have the class collaborate on a project and paint a section of neglected wall to create a mural or by taping large pieces of paper together to make one big piece of art for the classroom.