[danberger]

Open Terminal...

  cd /Users/dan/Library/Application Support/Sublime Text 2/Packages
  git clone https://github.com/daylerees/colour-schemes

In Sublime -> Preferences -> Color Scheme

[Achshar]

But this would require git, right? i use mercurial and don't have git installed.

[Cthulhu_]

Nobody's stopping you from installing Git alongside Mercurial; even if you're not going to use it on a day to day basis, things like sublime text themes and whatnots are easily installed with a git clone.

[Torn]

Yeah use the right tool for the job, and don't be afraid to try out others, even if you've already 'picked a stack' for your latest project.

[judofyr]

Replace the second step with this then:

    curl -L https://github.com/daylerees/colour-schemes/archive/master.tar.gz | tar -zxf -