Well, I would not want to use the Paypal image because that will confuse users even more. I have a lot of people complaining that they do not want to use Paypal. When I explain them that they can purchase a subscription wihout Paypal they decide to subscribe.

I would like a standard button that I can change using stylesheets.

You can include an image in the package. The user can then decide to localize that if needed. I like this button: http://www.webmasterworld.com/donate.htm