The official list of things that are blue

According to Eiffel 65's early aughts hit "Blue (Da Ba Dee)"
  1. I'm blue
  2. My house
  3. My window
  4. My corvette
  5. The clothes that I wear
  6. My girlfriend
  7. The streets
  8. The trees
  9. The people that walk around
  10. The corvette that's standing outside
  11. The words I say
  12. The words I think
  13. The things I say
  14. The sky though it is not mentioned