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[Scott David Daniels]

Perhaps better (adds '.png' more easily, keeps original case):
     ...
     for name in files:
         lname = name.lower()    # if on windows
         for ext, names in filenames.iteritems():
             if lname.endswith(ext) and 'ocean' in name:
                 names.append(os.path.join(root, name))
                 self.listbox1.insert(END, name)
                 break
     ...
-- 
-Scott David Daniels
Scott.Daniels at Acm.Org