a blue berry bush
'Blue filming' is apparently a 'street term' for spotting in-process filmmaking in local areas. The term could come from the notion that 'blue' is slightly illegal or shady.
its baseball because you run around bases and you play with a ball
the tools of ignorance refer to the catchers gear
There isn't really a "blue" Wiemaraner it is used as a term for the wiemmy's Blue like coat such as a Blue Russian there coat is a type of Gray but it looks in a way blue. This goes the same for Whimmy's although some look more gray then blue.
In the navy, when a boat lost its captain, blue flags would be hung above the deck. When returning to land a blue banner would be stretched out across the length of the boat.
The term "blue moon" is used when something very rare happens, the most common usage of this term is "Once in a blue moon".
The term refers to policemen
The term "red herring" actually originates from the practice of using a strong-smelling smoked herring to distract hunting dogs from the scent they were supposed to follow. There seems to be a confusion in the question; there is no common term "blue herring" in this context.
From the old days of Baseball. If a game was rained out, the patrons were affered a voucher to attend another game for free.
Yes, all of the Nintendo handhelds come in a blue version.
The term greasers come from their greasy hair