Through my experiences of dealing with customers its always been that they ask “Could that be red instead of blue?” or”Can this be moved here”. Before Photoshop it would mean changing the CSS which would either be a colour code or something potentially more significant. After which they then change their mind and say they preferred it blue and the moved item now doesn’t look right.
Whenever I get a chance I enjoy playing about seeing what I think could look good and then wonder how it could be coded up. The following are some examples of this in action. Enjoy.