Download Perl script from here.

Usage: perl tp_to_html.pl biglist.taskpaper bigstyle.css

You give it a .taskpaper file and (optionally) a css file, and it’ll generate an html file that’ll contain ul and li elements (you can change the code to use blockquotes and divs, if you want), each set to a class corresponding to the item type – project, task, or note. You can then style those elements and classes in the css file.