Although i can build a site on my own from scratch. I am not a designer so it takes a lot of time to come up with something which i am satisfied with. So this is what i do to produce decent looking ones in short span of time.

I normally bookmark sites/admin which are impressive under different categories. I do lot of scouting in builtwithbootstrap.com and builtwithbootstrap.com. This helps me to arrive at a layout idea and color scheme to make the website look professional. I steal small css snippets from many different places(not all from one place) i have scouted and put them all together. After the layout is done - i do the customization to all the snippets till i feel it has a look of it's own. Then it's usually bit of jquery, follow little seo recommendation and google analytics. Newsletter/contact form is normally done with a bit of php. This process helps me to come with something decent in very little time. Once uploaded and if the product/project gains traction - will immediately outsource the website development.