In the past we have released several identity sets that include invoice templates intended for printing or for sharing as a PDF, but today we have a template that will allow you to easily create an HTML/CSS version of your invoice. Some designers prefer to use coded pages for invoices, in many cases implemented into a web app or software for managing invoices. This template was designed by Tomas Laurinavicius and it uses a wood background to help give your invoices a stylish look. See a full-size screenshot of the template here. The PSD file is included.

http://vandelaypremier.com/career-resources/html-invoice-template/