Adrian,
there is no functionality for that.
There is a workaround by using formula in manipulate tab. It will work great on strings but as soon as you have calculations or currency fields, it won’t work. So be careful using it.
Example: I list opportunities and I want the sales stage field to be red when opportunity sage is “Prospecting”
I store the value for field in a variable that I call “stage”
In formula I write php code and add an html Tag for color:
({stage} == “Prospecting” ? “”.{stage}."" : {stage})
Val