How to change the appearance of Eclipse in Linux

Default fonts size of Eclipse editor , Tab , Menu and other text comes with large. To changes the appearance

1. To change the tab spaces and hight

 ECLIPSE_HOME/plugins/org.eclipse.platform_4.2.0.v201206081400/css/e4_default_gtk.css

.MPartStack {
        font-size: 9;
        font-family: "Droid Sans";
        swt-simple: false;
        swt-mru-visible: false;
}

2. To change Editor text size and style

Eclipse -> Preference

3. To change Windows , Menu and other negotiations

Somewhere on your home directory, create a gtkrc file (like: ~/.gtkrc-eclipse) with following content:

style "eclipse"  {
        font_name="Sans Condensed 8"
        GtkButton::default_border={0,0,0,0}
        GtkButton::default_outside_border={0,0,0,0}
        GtkButtonBox::child_min_width=0
        GtkButtonBox::child_min_heigth=0
        GtkButtonBox::child_internal_pad_x=0
        GtkButtonBox::child_internal_pad_y=0
        GtkMenuItem::horizontal-padding=0
        GtkToolbar::internal-padding=0
        GtkToolbar::space-size=0
        GtkOptionMenu::indicator_size=0
        GtkOptionMenu::indicator_spacing=0
        GtkPaned::handle_size=0
        GtkRange::trough_border=0
        GtkRange::stepper_spacing=0
        GtkScale::value_spacing=0
        GtkScrolledWindow::scrollbar_spacing=0
        GtkExpander::expander-size=0
        GtkExpander::expander_spacing=0
        GtkTreeView::vertical-separator=0
        GtkTreeView::horizontal-separator=0
        GtkTreeView::expander-size=0
        GtkTreeView::fixed-height-mode=TRUE
        GtkWidget::focus_padding=0
}
class "GtkWidget" style "eclipse"

Finally, to launch eclipse, use following command line:

GTK2_RC_FILES=/usr/share/themes/Clearlooks/gtk-2.0/gtkrc:/home/user/.gtkrc-eclipse '/opt/eclipse-3.3/eclipse'

or, for a desktop icon:

env GTK2_RC_FILES=/usr/share/themes/Clearlooks/gtk-2.0/gtkrc:/home/user/.gtkrc-eclipse '/opt/eclipse-3.3/eclipse'

Ref : http://techtavern.wordpress.com/2008/09/24/smaller-font-sizes-for-eclipse-on-linux/
http://hwellmann.blogspot.sg/2012/06/fixing-editor-tab-fonts-in-eclipse-juno.html