From your showcase, it looks like the only color options are black and white.. How easy is it to change the color of the navbar to match a site that may benefit from a matching navigation color scheme?

Hello David,
The Bootstrap 3 Framework includes 2 types of navigations that we are using in the extension - a white one and a dark one.
Of course you can change the navigation background color, text color and active state color by just adding those in a custom css file. It is as easy as:

.navbar-default {
    background-color: #F8F8F8;
    border-color: #E7E7E7;
}
.navbar-default .navbar-nav > li > a {
    color: #777777;
}
.navbar-default .navbar-nav > .active > a, .navbar-default .navbar-nav > .active > a:hover, .navbar-default .navbar-nav > .active > a:focus {
    background-color: #E7E7E7;
    color: #555555;
}

can you add a image file to spice up the menu? like wood grain or something?

Hello,
You can change the style of the navigation using CSS. There you can specify an image instead of a background color.

How? sorry I am new to programing

In my previous post i explained which css classes need to be edited in order to change the navigation style.
If you do not know what is css and background-image please refer to this website: www.w3schools.com/css/css_background.asp