Glad you have something that works for you. The basic way to color the admin menus is the following (plus whatever border etc etc you want)
/* menu background */
.admin_menu .menulevel2, .admin_menu .menulevel3 {
background: blue;
}
/* menu hover color. */
.admin_menu .linklevel1:hover, .admin_menu .listlevel1:hover .linklevel1,
.admin_menu .linklevel2:hover, .admin_menu .listlevel2:hover .linklevel2,
.admin_menu .linklevel3:hover, .admin_menu .listlevel3:hover .linklevel3
{
background: green;
}