It's just so damn cheerful, although it has the potential of being overwhelming, like staring into the sun too long.
  1. Lemons.
    Obviously.
  2. Fiesta mixing bowls
    I have my grandmother's complete set, and frequently use the yellow one for potlucks. Perks up any table.
  3. Hanging file folders
    Opening file drawers of tax documents and other unpleasant papers is a little less unpleasant when welcomed with a cheerful yellow.
  4. Legal tablet
    On a related note ... yellow assists with concentration and memory.
  5. Sunflowers and daffodils
    Lying down in a field of them, absorbing the goodness.
  6. Yellow Brick Road
    Again, obviously.