QtCreator Zenburn

zenburn.xml

<?xml version="1.0" encoding="UTF-8"?>
<style-scheme version="1.0" name="zenburn">
  <style name="Text" foreground="#dcdccc" background="#3f3f3f"/>
  <style name="Link" foreground="#8cd1d3" bold="true"/>
  <style name="Selection" foreground="#333333" background="#f18c96"/>
  <style name="LineNumber" foreground="#9fafaf" background="#262626"/>
  <style name="SearchResult" foreground="#FFFFE0"/>
  <style name="SearchScope" foreground="#FFFFE0" background="#3f3f3f"/>
  <style name="Parentheses" foreground="#dca3a3" background="#3f3f3f" bold="true"/>
  <style name="CurrentLine" foreground="#000d18" background="#8faf9f"/>
  <style name="CurrentLineNumber" foreground="#3f3f3f" background="#8faf9f" bold="true"/>
  <style name="Occurrences" foreground="#000000" background="#dcdcdc"/>
  <style name="Occurrences.Unused" foreground="#c0c0c0"/>
  <style name="Occurrences.Rename" foreground="#000000" background="#ffc8c8"/>
  <style name="Number" foreground="#8cd1d3"/>
  <style name="String" foreground="#cc9393"/>
  <style name="Type" foreground="#dfdfbf" bold="true"/>
  <style name="Local"/>
  <style name="Field"/>
  <style name="Static" foreground="#c0bed1"/>
  <style name="VirtualMethod" italic="true"/>
  <style name="Function" foreground="#efef8f"/>
  <style name="Keyword" foreground="#f0dfaf"/>
  <style name="PrimitiveType" foreground="#808000"/>
  <style name="Operator" foreground="#f0efd0"/>
  <style name="Preprocessor" foreground="#ffcfaf"/>
  <style name="Label" foreground="#dfcfaf"/>
  <style name="Comment" foreground="#7f9f7f" italic="true"/>
  <style name="Doxygen.Comment" foreground="#7f9f7f"/>
  <style name="Doxygen.Tag" foreground="#80d4aa"/>
  <style name="VisualWhitespace" foreground="#c0c0c0"/>
  <style name="QmlLocalId" foreground="#EFDCBC" italic="true"/>
  <style name="QmlExternalId" foreground="#EFDCBC" italic="true"/>
  <style name="QmlTypeId" foreground="#DFDFBF"/>
  <style name="QmlRootObjectProperty" foreground="#EFEF8F" italic="true"/>
  <style name="QmlScopeObjectProperty" foreground="#EFEF8F"/>
  <style name="QmlExternalObjectProperty" foreground="#EFEF8F" italic="true"/>
  <style name="JsScopeVar" foreground="#F0DFAF" italic="true"/>
  <style name="JsImportVar" foreground="#F0DFAF" italic="true"/>
  <style name="JsGlobalVar" foreground="#F0DFAF" italic="true"/>
  <style name="QmlStateName" foreground="#F0DFAF" italic="true"/>
  <style name="Binding" foreground="#F0DFAF" bold="true"/>
  <style name="DisabledCode" foreground="#7F9F7F" italic="true" />
  <style name="AddedLine" foreground="#709080" background="#313c36"/>
  <style name="RemovedLine" foreground="#f18c96" background="#464646"/>
  <style name="DiffFile" foreground="#ecbcbc" background="#41363c"/>
  <style name="DiffLocation" foreground="#dcdccd"/>
  <style name="DiffFileLine" background="#ffff00"/>
  <style name="DiffContextLine" background="#afd7e7"/>
  <style name="DiffSourceLine" background="#ffdfdf"/>
  <style name="DiffSourceChar" background="#ffafaf"/>
  <style name="DiffDestLine" background="#dfffdf"/>
  <style name="DiffDestChar" background="#afffaf"/>
</style-scheme>

Based on the zenburn theme for older QtCreator, created by github user photex, at https://gist.github.com/photex/1418771

On Linux/OSX place file in
~/.config/QtProject/qtcreator/styles

On windows
Users\AppData\Roaming\QtProject\qtcreator\styles