I've learned to set my white balance for tungsten lighting when I'm indoors, preventing all those yellowed shots. But for the life of me, I cannot remember to change it back. Then I go outside and do something like this:
Now, I will admit that on occasion, the blue is kind of groovy. But under most circumstances, I prefer a more realistic look.
Example #2, with the correct white balance:
I haven't come up with anything yet, but I need a little mnemonic, ditty, or something to jog my memory whenever I turn my camera on. Let me know if you have any good ideas.