If you really want to start an economic war against Germany then you guys will be back in the stone age pretty soon. I guess some authentic ancient Greece theme park would draw a lot of tourists into your country but you might not find it as comfortable as it's today.
First the German products are between the best products on the earth. So who boycott them must be stupid. Everyone who want the best will be the best with those. Second this racism is not fair. Germany has major contributes in the lives of the Greeks. The pensions and the salary of Greeks are high because of the money given by the Germany. It is not good to be ungrateful.