Starting in 2013 , you can import syntax themes from two formats:
- monodevelop / xamarin
json native files - visual studio
vssettings
While you can find syntax themes in json (like zenburn ), the final place is studiostyles , which will allow you to load many themes in vssettings format.
Once you have downloaded the vsettings file, just go
Tools > Options > Text Editor > Syntax Highlighting
And click the Add button, choosing the format you want to import: Color Schemes (json) or Visual Studio .NET settings (vssettings)
Et voila!

Note : it seems that the old xml format is no longer supported
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