By far the most popular family of color schemes, in Sublime-universe, is: Monokai family. That said, if you really care about the visual appeal of your text editor (you should: as a programmer you probably spend most of your day staring at it) you will set multiple color schemes depending on the file type.
Following is a list of various themes and the file types I use them with, that I have found super-convenient (please note: some of these themes assume that you already have SublimeLinter package installed):
General color scheme: Monokai Soda. This is actually a Theme, rather than a color scheme, but when you install the theme, it also enables corresponding color schemes.
"color_scheme": "Packages/User/SublimeLinter/Monokai Soda (SL).tmTheme",
Markdown: MarkdownEditing is a very nice theme for editing Markdown files. It also comes with a light theme, which I use for the Distraction-Free mode.
"color_scheme": "Packages/User/SublimeLinter/SunnyVale Theme Dark (SL).tmTheme",
JSON: Monokai Neue. This is the only theme that highlights JSON keys deep down the hierarchy. Most themes only highlight top-level keys.
"color_scheme": "Packages/Monokai Neue/Monokai-Neue.tmTheme",