The HSCustom theme was originally created for my band's website.
The HSCustom theme was originally created for my band. The band died but the theme lives on!
Add Products.HSCustom to the eggs parameter of your plone.recipe.zope2instance section:
[plone] recipe = plone.recipe.zope2instance ... eggs = ... Products.HSCustom
Now run buildout, restart Plone, and install the theme in Site Setup -> Add-ons.
This theme generally looks terrible; it’s just for fun (and the Plone 4 support needs some work.)