The default templates provided by ProcessWire hold a lot of stuff I usually drop when starting a new project. This is a stripped-down version of said templates, including a few templates I usually need in projects.
Note that this does not contain the default's CSS and JS files. I usually replace those with files provided by my HTML project boilerplate. Also note that since I'm German (and most of the sites I build are, too), I translated some hardcoded text into German.
To use these templates files, you need two lines in your /site/config.inc.php:
$config->prependTemplateFile = '_init.php';
$config->appendTemplateFile = '_main.php';