For prototyping or even some beta products any popular css/js framework would do. You should've heard about bootstrap.io, just make sure at the end when you go public, customize it a bit.. so it won;t look like other dozens of websites.
There was a great post on HN a couple of weeks ago, unfortunately I've lost said link - just google for 'x ways to make your website look better'.
If you upvoted the story, it should be in your saved stories link.
I know good stuff when i see them, but don't know how i can create them. The real problem is i cannot figure out my way to gradually improve my skillset and get there. :( That is actually my problem and the reason why i asked the question in the first place.
But thanks for the answer anyway... Cheers!