This is just something small I do that helps me- I move my eyes around whenever I am undergoing something stressful or saddening. It is something I began to do intuitively after reading about EMDR (eye movement desensitizationa and reprocessing) which uses guided eye movements in conjunction with therapy to treat trauma, depression and other things). Here's an article about EMDR on wikipedia:
http://en.wikipedia.org/wiki/Eye_mov...d_reprocessing
I just intuitively feel compelled to move my eyes in certain directions. I'm not sure if it's a subconscious knowledge. I know that moving the eyes to the right or left, up or down is supposed to activate different types of thoughts and emotions, different brain hemispheres. All I know is that I really believe that it helps my moods and it's something I can do anywhere in any situation. It's a subtle effect, but I feel that I notice a difference.
Another thing is I use NLP triggers to send myself messages about what I'm trying to do or feel or a change in perception that I'm trying to have.
Also, I try to vary things up, just all kinds of little things in my behavior and my atmosphere. Something as small as what I'm wearing, some little detail in my work space, or whatever, so it's just a little reminder of something symbolic for me or even just something different without any symbolic meaning. It sometimes seems to shake me out of old patterns and help me think and feel in new ways.
Humor too - if I spend some time really laughing it seems to brighten my outlook a little bit for the whole day.
All these things help me a bit, and it all adds up, but of course they are not a cure for serious depression, but they can avert a downward spiral sometimes, for me.