This is a start at a GTK look and feel for Java.
It is usable already, but it mainly just defaults back to Basic Look and
Feel for everything.

Sliders are currently broken.  I haven't figured out why yet.

A bunch of system colors defined in GtkLookandFeel though I have a feeling 
I'll be defining more ColorUIResources shortly.

Based on Gnome File Manager colors... or my Window Manager setup

desktop			#000000	(gtk)
activeCaption		#163555	(window manager)	
activeCaptionText	#FFFFFF	(window manager)
activeCaptionBorder	#000000 (unsure of this)
inactiveCaption		#375676 (window manager)
inactiveCaptionText	#999999 (window manager)
inactiveCaptionBorder	#000000 (unsure of this)
window			#FFFFFF (gtk)
windowBorder		#969696 (gtk)
windowText		#000000 (gtk)
menu			#d6d6d6 (gtk)
menuText		#000000 (gtk)
text			#FFFFFF (gtk)
textText		#000000 (gtk)
textHighlight		#00009c (gtk)
textHighlightText	#FFFFFF (gtk)
textInactiveText	#999999 (unsure of this)
control			#d6d6d6 (gtk)
controlText		#000000 (gtk)
controlHighlight	#eaeaea (gtk)
controlLtHighlight	#eaeaea (unsure of this)
controlShadow		#c3c3c3 (gtk)
controlDkShadow		#888888 (unsure of this)
scrollbar		#c3c3c3 (gtk)
info			#d6d6d6 (gtk)
infoText		#000000 (gtk)