Well, the excitement builds as some blue goes on. Carefully selected by Anna, there are so many shades of blue the TARDIS has been over its time on tele. from a dirty sort in the old black & white ones to a dull dark one in the 70s to the moody mid 200os one to the in-your-face bright blue one at present.
We’ve gone for a colorbond blue which is sort of a grey-blue but it depends on the light that your looking at it with, of course.