Can I use wordpress themes without wordpress?

/wp-content/themes/twenty-twelve/style.css

will have a lot of the visual elements of the theme in it to get inspiration, however you must realise that each of the elements coded into the css is designed to go with each one of the div or other elements designed in wordpress… Back coding it will almost be harder than writing it from scratch.

Also WordPress is now an incredibly powerful tool with infinite customisation abilities. It’s not just the blogging tool it used to be years ago. There’s not much else out there that can achieve so much for the price (or lack of it) and have so many support channels for you to get to grips with it (ie WPSE!!)