Ask HN: Are there any HN clones out there?

I found about forlue (http://forlue.com/) on another post, which seems to be an HN clone for designers. As I really like the style and design of HN, I was wondering if there were any other clones out there targeting different audiences. I'd also like to hear people's thoughts on having someone copy a website's design (such as HN's). Is this legal? I know HN's source code is public, but I don't know the exact legal conditions that go along with it.