Note to readers: I had originally e-mailed Jeff Burns via his website,
AdaptiveThemes.com . He very quickly pointed me in the right direction, in both my query and how I asked for help. To the latter point, I recreate the request/response below. Genesis rocks for theming (not that I have a lot of experience with Drupal theming, this being my first site, but it really was relatively painless to customize his theme), so Thanks Jeff!!!!

Once Jeff pointed out what I was missing (it's a graphic, dummy!), I downloaded it, changed it's colour in Photoshop, uploaded the new file, and Bob's yer uncle! Unfortunately, the powers that be have decided to go in another direction for this site, so my work of a week (not too shabby considering I had never touched Drupal before this project!) can't be viewed by the community. Status may change, but I won't know the direction for a day or two.

My E-mail:

First, thanks for creating a really easy theme environment to customize! Your video tutorials are really informative, and as a FF/Firebug user for a while, it was nice to see a real expert put things to use!

I am using Darkmatter as a basis subtheme, and have run into a challenge in changing the formatting for some Primary Link menu buttons. I am trying to change the colour for the hover/active button backgrounds from the purple in your design to another colour, but I can't find where you have set the colour. Inspecting the elements gives me the hyperlink info, but not the button background info. Can you point me to the right place?

Jeff’s Reply:

Jeff Burns wrote on January 12, 2009 03:04:49 PM PST:

Hi Bruce,

Its in the genesis_darkmatter.css file, around line 250 or so (by memory...),
note that its an image, a small gradiant that is tiled in the background on hover:

#primary ul.links li a:hover,
#primary ul.links li a.active {
  background: #333 url(images/primary_tile.png) repeat-x left bottom;
  color: #FFF;
  border: 0.1875emsolid #444;
}

Its a pet peave of mine also that you cant inspect the hover css! Thats where you just have to read through the CSS file or sometimes I use the Web Developer Toolbar to view the CSS and just search for "hover" or "primary" and scan through until I find what I'm looking for.
Hope that helps! It would be better in the future if you can post issues in the issue queue on Drupal.org, that way lots of uses can benefit from the questions and answers (I bet others will have the same question at some stage).

/Jeff