Find the following in styles.css for that skin...
div.pageHeader /* Title zone */

{
	margin: 0 1ex;
	padding: 0;
	background-image: url(img/squares.gif);
	background-repeat: no-repeat;
	background-position: right center;
	/* border: 1px solid #f00; */
}

and simply add "height:108px;"

{
        height:108px;
	margin: 0 1ex;
	padding: 0;
	background-image: url(img/squares.gif);
	background-repeat: no-repeat;
	background-position: right center;
	/* border: 1px solid #f00; */
}

Thanks John for your response. However, although I made that change you suggested, it does not produce any difference at all in the height of that header section.

What I am talking about is the box below the blog titles, a small area which has it's own background image (on the default niftycorners skin configuration, it's a file named squares.gif).

Irrespective of whatever number I put into that pageheader section (on the styles.css) for the height (even up to 200) and no matter the height of my background image (I tried several), the dimensions of that "box" below the Blog titles does not change.

It is very strange... something must be controlling the size of that area (it stays so consistent, to my calculations, about 55 pixels high), but I can't seem to find what to change.

Try adding height to the following...

h1#pageTitle {
	font-size: 250%;
	font-weight: bold;
	margin: 0;
	padding: 0;
	color:#06a3c4;
}

John, putting a height entry into that section was not effective, however, that was good guidance by you to point me to that h1#pageTitle area, because it led me to discover the solution for what I was hoping to achieve.

The good news is that I achieved my goal by inserting the following entry into that listing of properties:

padding-top: 25px;

I then was able to use the taller background image jpg, which I had wanted to include and I have now achieved the look I was seeking. Thanks for your help John. You certainly got me going to the correct css file (and the proper area in that file) and that enabled me to experiment so I could find the solution. Mission accomplished.

For future reference (for those like me who are css amateurs) here is a great site which demonstrates css style properties dynamically (the left hand column has various properties to examine). This is where I experimented and found the property I was looking for. I plan to use the site to learn how to do other changes as well:

http://www.w3schools.com/css/css_howto.asp

You may wish to bookmark this one.

Glad it's sorted. I only have a version of that skin without any images so I couldn't really relate to your specific issue.