How to change MSSQL Management Studio theme?
Install the 2010 Color Theme Editor in VS 2010. 
Find the files somehwere in C:\Users\xxxxx\AppData\Local\Microsoft\VisualStudio\xx.x\Extensions\ .. for me, it was in \shvn3avp.com for the current version of the plugin.
Copy those files to a new folder: C:\Program Files (x86)\Microsoft SQL Server\xxx\Tools\Binn\ManagementStudio\Extensions\VSTheme
Replace extension.vsixmanifest contents with:

&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;Vsix xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="1.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2010"&gt;
&lt;Identifier Id="46b3817c-b0c3-42d1-8cea-d373f781b21e"&gt;
  &lt;Name&gt;Visual Studio Color Theme Editor&lt;/Name&gt;
  &lt;Author&gt;Microsoft&lt;/Author&gt;
  &lt;Version&gt;1.3&lt;/Version&gt;
  &lt;Description xml:space="preserve"&gt;Allows users to customize the color palette used for menus, toolbars, tabs, title bars, and other environment colors.&lt;/Description&gt;
  &lt;Locale&gt;1033&lt;/Locale&gt;
  &lt;Icon&gt;ThemeManagerIcon.png&lt;/Icon&gt;
  &lt;PreviewImage&gt;ThemeManagerPreview.png&lt;/PreviewImage&gt;
  &lt;InstalledByMsi&gt;true&lt;/InstalledByMsi&gt;
  &lt;SupportedProducts&gt;
    &lt;IsolatedShell Version="1.0"&gt;ssms&lt;/IsolatedShell&gt;
    &lt;VisualStudio Version="10.0"&gt;
      &lt;Edition&gt;Ultimate&lt;/Edition&gt;
      &lt;Edition&gt;Premium&lt;/Edition&gt;
      &lt;Edition&gt;Pro&lt;/Edition&gt;
      &lt;Edition&gt;IntegratedShell&lt;/Edition&gt;
    &lt;/VisualStudio&gt;
  &lt;/SupportedProducts&gt;
  &lt;SupportedFrameworkRuntimeEdition MinVersion="3.0" MaxVersion="6.0" /&gt;
  &lt;SystemComponent&gt;true&lt;/SystemComponent&gt;
&lt;/Identifier&gt;
&lt;References /&gt;
&lt;Content&gt;
  &lt;VsPackage&gt;ThemeManagerPackage.pkgdef&lt;/VsPackage&gt;
&lt;/Content&gt;



Import this setting:
http://studiostyl.es/schemes/vs2012-dark-theme-for-vs2010
On the Customize Color dialog that opens on the Theme menu provided by the extension import his theme


Result:



For 2015 and SQL Management Studio 17RC1

Install the extension on VS2015 instead. Follow the above steps.

The folder on my computer was C:\Users\xxxxxx\AppData\Local\Microsoft\VisualStudio\14.0\Extensions\owbugenu.gif

The xml is:

&lt;!-- language: lang-xml --&gt;
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;Vsix xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="1.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2010"&gt;
  &lt;Identifier Id="B8CED2B3-FF48-4204-88E9-036CA39B83C8"&gt;
    &lt;Name&gt;Visual Studio 2015 Color Theme Editor&lt;/Name&gt;
    &lt;Author&gt;Microsoft&lt;/Author&gt;
    &lt;Version&gt;2.0&lt;/Version&gt;
    &lt;Description xml:space="preserve"&gt;Allows users to create and edit Visual Studio themes.  Themes can customize colors used for menus, toolbars, tabs, titlebars, the text editor, and other environment colors.&lt;/Description&gt;
    &lt;Locale&gt;1033&lt;/Locale&gt;
    &lt;InstalledByMsi&gt;true&lt;/InstalledByMsi&gt;
    &lt;SupportedProducts&gt;
      &lt;IsolatedShell Version="1.0"&gt;ssms&lt;/IsolatedShell&gt;
    &lt;/SupportedProducts&gt;
    &lt;SupportedFrameworkRuntimeEdition MinVersion="4.0" MaxVersion="4.0" /&gt;
    &lt;SystemComponent&gt;true&lt;/SystemComponent&gt;
  &lt;/Identifier&gt;
  &lt;References /&gt;
  &lt;Content&gt;
    &lt;VsPackage&gt;ColorThemeEditor.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\Red.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\Purple.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\Green.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\Tan.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\DarkWithLightEditor.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\LightWithDarkEditor.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\SolarizedDark.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;Colors\SolarizedLight.pkgdef&lt;/VsPackage&gt;
    &lt;MefComponent&gt;ColorThemeEditor.dll&lt;/MefComponent&gt;  
    &lt;VsPackage&gt;Colors\ThemeNames.pkgdef&lt;/VsPackage&gt;
    &lt;VsPackage&gt;PkgDefAssemblyCodeBase.pkgdef&lt;/VsPackage&gt;
  &lt;/Content&gt;
&lt;/Vsix&gt;