Blue Monday comes from the eighteenth-century naval practice of noting offenses during the week and arranging floggings for punishments on the following “black and blue Monday.”

source: Pei, Mario, The Story of the English Language, Simon and Schuster, New York, 1967

note: The blue Monday (a.k.a. Monday sickness or Monday syndrome) that you know has a contemporary definition. 

I sure am glad we don’t flog anymore, except with words, which can hurt worse, actually.

I knew Garfield had a hatred against Mondays, but I think this shows a little more understanding for the character.

Not a big deal really, just another bloomin’ day.

I have no problem with Mondays. Actuall look forward to them after busy weekends.

I love Fridays! Thank God it’s finally Friday today!!

Still Thursday here, enjoy your day.

Blue Monday.
My screen on the site just became very small: did it happen to anyone else????

Not a blue Monday for me. It’s a blue-ming (blooming) Monday, just like what Doug said. 

I want to see fran’s blooming face!!!

It turned red when I clicked CODE.

Must be different for different folks.
It’s just like me trying to upload my avatar.  I turned off the computer, and tried again and the one I wanted did not come on.  Just the Indian.

What is the color for TUESDAY?

I don’t think any of the other days have any colors. You can pick your own if you like.

How about FRIDAY?
Or Friday the 13th?