I am attempting to make a reference book for the 737 ocerhead panel and would like to get a good clear picture of the panel that I can either print, copy, purchase or whatever. Any help would be appreciated :)

Does this help?http://www.b737.org.uk/Cheers,Pedro Venda.

The owner of that site has written his own book on the 737 so would be unlikely to offer photos from his own colection. I would suggest looking on Airliners.net, finding a photo that suits your needs, then contacting the photographer to gain permission for using it.