I was in the bus to school when I realized there were so many people dragging their feet to work (even though it was already Tuesday). A phrase pops into my mind: "Monday Blues". Then I questioned myself again, why is 'Blue' always associated with sadness and depression? and I did a little bit of research :)
Well, on a personal note, I am in love with blue because the direct translation of my Chinese last name to English is Blue :) and I think I am a pretty optimistic person.
The main point is that... look at the beautiful blue skies :D you don't get to see them during thunderstorms :) isn't that an indication of hope and a sign for celebration?