TOD, when I'm starting to feel blue, I try to relax, just be quiet. Then I read a book, disappear into a movie, or just do what's in front of me...if there is a chore or a project or anything, I just start doing it, whether I want to or not, and if all else fails.....ICE CREAM!!!!!
I do like to go for a drive. I guess any change of scenery. Maybe work in a different room of the house, bake some cookies, buy myself a nice bunch of flowers, just pamper myself. Vent to friends....listen to a cat purr...