ok using winscp navigate to
/usr/share/themes/alpha/gtk-2.0 and you should see these 4 files double click the first (gtkrc) and a page will open up with a long list of all sorts you then need to click on th binoculars icon and type the word logical then "find next" and it will take you to the correct place on the list that you need to be which is "Logical color definitions"
then change the corrosponding numbers its the first 2 in the list for what you need. but remember other parts of the phone will change too, its a trial an error thing.