If you're talking about the HTML involved, you could use the
<body> tag to define the default color for hyperlinks, and then use inline styles to change the color of any links you'd like to be different.
This will make all links default to a certain color:
<body link="#336699">
Then, use styles to make certain links a different color:
<a href="http://www.whatever.com/" style="color : 000066">Click here.</a>
Hope that's what you were looking for.