I think that self-expression and prodictivey/sense of acivemnt are healing of themselves.

Well yes, I said that :P See earlier comment to aquaeri above.

"Gardening or farming tend to be good because they involve helping the plants to grow, which improves your sense of self-worth as well as getting you outside in the sunlight. Baking is good because it involves making something - possibly to share with your friends - which improves self-esteem as well as providing a carbohydrate boost to serotonin levels."