I've never heard of anyone selling or giving away enhanced email templates. However, it's quite easy to fix them up. They're all in the "email" folder at the top level of the site, and each is simply an HTML file containing contents and a style section at the top. Make a copy of one of them, replace the define calls (things like $EMAIL_GREETING) with some suitable words and save it in a handy location on your hard drive. Then open it in a browser window for viewing the results, open the same file in your text editor, start changing the styles and saving and previewing in the browser. When satisfied, save the styles back to the original file. If I were me, I'd try to develop a style set which could be used for all of them instead of having a custom one for each.
Rob