Below are the few links to install sample databases on the SQL Server.
http://sqlserversamples.codeplex.com/
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=10679
http://www.microsoft.com/download/en/details.aspx?id=23654
http://blog.sqlauthority.com/2008/08/10/sql-server-2008-download-and-install-samples-database-adventureworks-2005-detail-tutorial/