I know little about art therapy, but if it engages clients actively by having them participate in the creation of something (rather than passively having them appreciate works of art), then I should think the very act of participating in art therapy is somewhat therapeutic and I should think it produces material of immense significance with respect to conceptualizing the client. This art is (and has been for some time) lost within the community of trained PhD and PsyD psychologists due in part to the need for programs driven by APA accreditation and managed care reimbursement policy to address only those aspects of assessment, diagnosis, & treatment that lend themselves to psychometric profiling, norming, and manualized training.

Wyatt Ehrenfels
http://www.fireflySun.com/news.html