Problem has now been solved using the following code in functions.php
function your_custom_function_name()
{
echo '<link rel="stylesheet" href="' . admin_url('css/colors/coffee/colors.css') . '" type="text/css">';
}
add_action('admin_print_styles', 'your_custom_function_name');
add_action('wp_print_scripts', 'your_custom_function_name');
Keep in mind the code above works for the 'Coffee' color scheme. If you want to use any of the other color scheme, you need to change the admin_url(parameter) to reference the correct directory.
And if you haven't yet set the desired color scheme as default for all users, you can use this piece of code (again, in functions.php)
function your_other_custom_function_name($user_id) {
$args = array(
'ID' => $user_id,
'admin_color' => 'coffee'
);
wp_update_user( $args );
add_action('user_register', 'your_other_custom_function_name');
}
Once again, you need to change the 'admin_color' => 'parameter' to match your desired color scheme