How to change the background color of default magento generated invoice pdf that's generated to print?

Question

Can anyone give any idea on where the html files are located that generates the invoice pdf while trying to print it out(in admin).Also I need to modify the background color from the one as in the default one that is generated by magento. Thanks in advance.

Answer 1

This should help get you started: http://www.magentocommerce.com/wiki/how-to/editing_an_invoice_pdf