Eclipse Looka and feel on Ubuntu

Instructions.txt

eclipse.ini add these 2 lines ->

--launcher.GTK_version
2

before:
--launcher.appendVmargs

This will cause eclipse to use GTK2 instead of GTK3.

Verify by checking (Menu)Help->About Eclipse->(Button)Installation Details->(Tab)Configuration->(TextArea)
org.eclipse.swt.internal.gtk.version=2.*.*

new file ".gtkrc-eclipse" put it somewhere special (/home/$user/.gtkrc-eclipse) (Content)->
###BOF###
style "gnome-color-chooser-tooltips"
{
  bg[NORMAL] = "#FFFFAF"
  fg[NORMAL] = "#000000"
}
widget "gtk-tooltip*" style "gnome-color-chooser-tooltips"

style "gtkcompact" {
  font_name="Sans 9"
  GtkButton::defaultborder={0,0,0,0}
  GtkButton::defaultoutsideborder={0,0,0,0}
  GtkButtonBox::childminwidth=0
  GtkButtonBox::childminheigth=0
  GtkButtonBox::childinternalpadx=0
  GtkButtonBox::childinternalpady=0
  GtkMenu::vertical-padding=1
  GtkMenuBar::internalpadding=0
  GtkMenuItem::horizontalpadding=4
  GtkToolbar::internal-padding=0
  GtkToolbar::space-size=0
  GtkOptionMenu::indicatorsize=0
  GtkOptionMenu::indicatorspacing=2
  GtkPaned::handlesize=4
  GtkRange::troughborder=0
  GtkRange::stepperspacing=0
  GtkScale::valuespacing=0
  GtkScrolledWindow::scrollbarspacing=0
  GtkExpander::expandersize=10
  GtkExpander::expanderspacing=0
  GtkTreeView::vertical-separator=0
  GtkTreeView::horizontal-separator=0
  GtkTreeView::expander-size=8
  GtkTreeView::fixed-height-mode=TRUE
  GtkWidget::focuspadding=1
}
class "GtkWidget" style "gtkcompact"
style "gtkcompactextra" {
  xthickness=1 ythickness=1
}
class "GtkButton" style "gtkcompactextra"
class "GtkToolbar" style "gtkcompactextra"
class "GtkPaned" style "gtkcompactextra"
###EOF###

Last but not least
/home/$user/.local/share/applications/eclipse.desktop (content)->
###BOF###
[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=Java - Eclipse
Icon=eclipse.png
Path=/opt/eclipse/java-mars/eclipse
Exec=env GTK2_RC_FILES=/path/to/.gtkrc-eclipse /path/to/eclipse
StartupNotify=false
StartupWMClass=Eclipse
OnlyShowIn=Unity;
X-UnityGenerated=true
###EOF###