Not so long ago I was asked by a client, if it was possible to change a couple of sections within their site as they just updated their product structure: the client was expanding their products to list two more categories. To make them stand out, their marketing team was thinking of using different colours throughout the main content area so that is looks much more consistent, which included changing all link colours and buttons to these new colours.
As a designer you have probably faced a similar situation before – can I or can I not change the link colours on certain pages to keep a consistent look and feel?