While reading this comment, I was thinking "tuesday is blue, friday? Definitely orange" and then read you saying (Friday was orange) a split second later
You might be associating orange with Friday because it makes you think of the sun and going outdoors?
It's all very interesting. Even more so because I don't think of days/colours. My mind gives the days size and mass. ie. starting with Sunday (I'm American) the day is small. And as the week progresses the days get larger, heavier and denser. Until Saturday, which is a big fat puffy ball of "day". You can do what you want with it and it will just be there and be your friend. I love Saturdays.
Nature abhors a vacuum, but it loves a rainbow.