you should try http://www.easyaccountancy.co.uk/resources/invoice_template.html i use this as a template to invoice web design/seo clients, its a pretty good, basic template =)
Just thought i would put a thread here to say hello to everyone as im new here =)
It looks like a nice community and i hope i can be of help to you all!
I work for a company that specialise in logo embroidery / printing and they often have to re-design people's logos. We have never had to gain prior permission before using fonts....