Make black navbar white and remove navbar's bottom border:
#gbx4 {
background-color: #fffffff;
border-bottom-width: 0px;
}
Make the top text black again:
#gbg .gbgt {
color: #fff!important
}
Make the selected item black again:
.gbz0l .gbts {
color: #000;
}
Also, the settings icon for a white background is part of this:
http://ssl.gstatic.com/gb/images/b_8d5afc09.png
This isn't everything, but it's a start. Any comments and thoughts are appreciated!