Better themes for drupal?

What do most people do here for themes? Being a drupal noob and coming from joomla where I can buy an awesome theme over at joomlashack.com and have it up quickly. Do most just tweak the themes available here to their liking? I have no idea on how to theme so not sure what to do here. I like the color scheme of the theme being used here. Is this one available on the site?