The easiest thing to do is select the colour that almost matches your site and then alter the eguru/style/color-scheme-1.css (or whatever color-scheme number you choose in the settings). There are four schemes and one default.
The color-scheme-1.css stylesheet looks like this: (see below) So it's just a matter of changing those color codes.
Here is a color picker to help you find the color code you want to change to:
http://www.w3schools.com/colors/colors_picker.asp
Hope this helps?
/*Core*/
h1,
h2,
h3,
h4,
h5,
h6 {
color: #20897b
}
a {
color: #20897b
}
a:hover,
a:focus {
color: #20897b
}
/*Core > dropdown*/
.dropdown-menu {
background: #4ba89c
}
.dropdown-menu > li > a:hover,
.dropdown-menu > li > a:focus,
.dropdown-submenu:hover > a,
.dropdown-submenu:focus > a {
background: #20897b
}