This archive replaces the dtlogin skin that changed sometime between Solaris 10 b69 and Solaris 10 Release back to the solid gradient from b69 SUNWdtdte. Don't worry about backing anything up. The archive contains backups of the Solaris 10 Release files that it overwrites under subfolders "new-ugly".
styleModern dtlogin theme from b69. Extract under /usr!