Install the Retina Theme through package control. It's the original theme with higher res icons.
It has a minor bug with the panel button. Add the following to a file called Retina.sublime-theme in your User home for sublime to fix it.
"layer0.texture": "Theme - Retina/panels.png",
Also if you are using windows, add "theme_font_options": ["gdi"] to your preferences. This will give you identical ui themes to the previous build