When it comes to real appreciation, this is one site you can visit often..I really recommend it.
You can find here nice piece of information about graphics and user interface tricks … real nice ..and pleasing for your eyes.
From here you can discover the icon set of OpenOffice or Gnome 2 or one interesting free editor Inkscape.
There will be followups about me using Inkscape.
Liviu Nastasa 
Check it out, it’s good!