Re: Data centre
About half way through my time at ICL, I recall being told that they had decided to go 'multi-coloured', on the finding that getting a replacement panel just the right shade of faded beige* to go with the old kit on their customer sites was well-nigh impossible. And that if all the machines were different colours it didn't matter.
*Or, indeed, 'just the wrong shade of pink'. ;o)