I’m helping on a site for a not-for-profit for which we selected “Expound” as the base theme. I like Expound; it looks great, there’s no jQuery- or webfont-cruft to worry about and although the CSS comes with a seperate reset.css-file, it does (Auto-)optimize perfectly.

But I wasn’t happy with the menu color-scheme and with the fact that the menu lacked an indication that a child page of a main entry was being shown instead of the page of that main entry itself (confused much?).

Anyway, this is what I ended up with;

For those wanting to do something similar, this is the relevant CSS in my child theme;

/* don't want no blue */
.navigation-main .current-menu-item > a {
        background: #557B47 !important;
}

/* triangle should not be blue either, need it to be a bit bigger */
.navigation-main ul > .current_page_item a:after, .navigation-main ul > .current-menu-item a:after, .navigation-main ul > .current-post-ancestor a:after, .navigation-main ul > .current-menu-parent a:after, .navigation-main ul > .current-post-parent a:after {
        border-top: 10px solid #557B47 !important;
        bottom: -14px;
        z-index: 1000;
}

@media screen and (min-width: 600px) {
  /* if page from submenu, add line under parent item to show your in that submenu */
  .navigation-main ul > .menu-item {
        border-bottom: 6px solid #3A3A3A !important;
  }
  .navigation-main ul > .current_page_item, .navigation-main ul > .current-menu-item, .navigation-main ul > .current-post-ancestor, .navigation-main ul > .current-menu-parent, .navigation-main ul > .current-post-parent {
        border-bottom: 6px solid #557B47 !important;
  }

  /* but not in submenu */
  .navigation-main .sub-menu > .menu-item {
        border-bottom: 0px !important;
  }

  /* less padding at the bottom to compensate for that extra line */
  .navigation-main a {
        padding: 10px 10px 4px !important;
  }

  /* except when in submenu */
  .navigation-main .sub-menu a {
        padding: 10px !important;;
  }
}

/* change color to default brown if child-item is active */
.navigation-main ul > .current_page_item, .navigation-main ul > .current-menu-item, .navigation-main ul > .current-post-ancestor, .navigation-main ul > .current-menu-ancestor, .navigation-main ul > .current-menu-parent, .navigation-main ul > .current-post-parent {
        background: #3A3A3A !important;
}

Have fun!