Examples:

• You know, you're feeling blue, you put on a pretty dress.
• When you're feeling blue, all you have to do is to take one or two
• Have a friend feeling blue?
• I bet you're feeling blue.
• I was feeling blue.
• The next time you feeling blue, let it go.
• Hey, Bud you know what I do when I'm feeling blue?
• It's good to get out when you're feeling blue.
• Clinical depression is different from feeling blue once in a while.
• They remind me always to smile even if I'm feeling blue.