ClipboardViewer is a qui app to display the current gnome clipboard either 
as text or a picture ( a la OSX ) in a small window.  You can also use it 
from the command line ( or script ) to print the text on the clipboard to 
stdout or create a png image file in the current directory.

A nautilus script to convert the clipboard contents into either a text or a 
picture clipping is installed in /usr/share/ClipboardViewer/scripts/ - you 
may want to create a symlink from this script to your own nautilus scripts 
directory (usually ~/.gnome2/nautilus-scripts/)

This requires libgnomeui.