How do you choose your desktop wallpaper (if at all)? and how often do you change it?
I find it is a real drag to choose something, because it never feels like I will stick with one if I ever choose one, and thus revert to a default and/or generic wallpaper. Such wallpapers leave me feeling very cold...they can even affect my mood: the one I currently have that is mostly blue and is a stylised Windows logo with lines reaching across the screen especially has that effect, because of its dark blueness in combination with the starkness of it all (I like blue...more sky blue though). An image of someone swimming in water with much of the depths visible makes me imagine a drowning...even a suicide, for example.
Having icons on the desktop means that the image must be fairly centralised, or be some pattern of some kind where the periphery is not necessarily important for the whole. I'd really like a wallpaper with something going on (whether with people, or as a general landscape, or some especially good pattern (it would have to be especially good).
I remember reading of someone who believed they changed their life by simply having a password like "forgiveher" which he had to enter many times a week...it helped improve their state mentally and helped them move on...and I think gave them a more balanced focus on life (at least that was what the person wrote). It would probably work for exercising more or for losing weigh or whatever...as I think I've said before I really do think that walking into rooms with a smile on your face can be highly important, and similarly, something like inadequate desktop wallpaper really bugs me!