crwdns2934241:0crwdne2934241:0 Demon

crwdns2934249:0crwdne2934249:0:

Well on my white MacBook, I've been using the thin sheet of perforated material that the laptop shipped with. 

If that doesn't work out for you, I would try one of the many third part alternatives such as

http://www.radtech.us/Products/NotebookScreensavrz.aspx

Hope that helps