I have always thought of the days of the week as having colours - sometimes I see the word written out in colour, other times like a coloured calendar... I know I'm not totally weird, because a Kate Atkinson book I read a while ago made reference to this! So:
Monday - yellow
Tuesday - green
Wednesday - orange
Thursday - dark green
Friday - purple
Saturday - some kind of light colour, not very sure actually
Sunday - dark red
Anyone else?!