I came across a statement that roughly translates as:
I hope everything is blue with you.
The original German/English statement is:
Ich hoffe, alles ist "blue" bei dir
This was sent to a German friend by a rather famous German sports person (J. Klinsmann, soccer) who has been living in the US for quite some time.
For me, the above expression suggests that "blue" has or is supposed to have a positive connotation, but I was unable to find any such meaning in my dictionaries.