Widget Title Color

try working with a browser inspection tool such as Firebug to find out which styles are responsible for formatting the widget titles;

then edit the stylesheet of your theme to adjust the color of these styles.

if you post a link to your site, somebody might have a look and might be able to make a suggestion, although helping with pure formatting issues is not the main focus of this forum;

better try to ask at a css forum like http://csscreator.com/forum

in style.css (not quite half way down), this is the style for the widget titles in general:

#sidebar h3 {
		margin: 0 0 15px 0;
	}

you can set the color there;
example:

#sidebar h3 {
		margin: 0 0 15px 0;
		color: #123edf;
	}

color codes examples: http://en.wikipedia.org/wiki/Web_colors

change the color of a widget title

if this means one specific widget title, then you need to find the specific css id of that widget; or post more details here.