Is quite simple and the results are quite impressive, it makes nautilus look much nicer.
First open nautilus and see if you have this file in your home directory ~/.gtkrc-2.0. If so, edit and paste the code below in it. If the file doesn't exist open gedit on paste the code below and save it as .gtkrc-2.0 in your home directory.
style "nautilus-sidepane" { GtkTreeView::even_row_color = "#F2F1F0" }widget_class "*NautilusSidePane*" style "nautilus-sidepane"
Ok, I'm off to do the same thing to my netbook.