All eclipse plugins related to the Java Development Tools (JDT) provide a common look and feel. A major reason for this is the common usage of icons for editors, views, popups and others.
Eclipse has documented and published those icons at
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fref-156.htm
Update:
The JDT icons for the Eclipse Juno Release can be found at:
http://help.eclipse.org/juno/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fref-icons.htm
Eclipse JDT Icons