tardis blue

Tardis blue is the particular shade of blue from the T.A.R.D.I.S.(Doctor Who).

Person 1: What shade of blue are Misha's

eyes?
Person 2: They are a beautiful tardis blue.

tardis blue

Tardis blue is a specific shade of blue often used in Fanfictions.

Person 1: What color are Castiel's eyes?
Person 2: His eyes are tardis blue.