qt-creator/share/qtcreator/styles/grayscale.xml

<?xml version="1.0" encoding="UTF-8"?>
<style-scheme version="1.0" name="Grayscale">
  <style name="AddedLine" foreground="#636363"/>
  <style name="Comment" foreground="#808080"/>
  <style name="CurrentLine" foreground="#000000" background="#f2f2f2"/>
  <style name="DiffFile"/>
  <style name="DiffLocation"/>
  <style name="DiffFileLine" foreground="#ffffff" background="#000000"/>
  <style name="DiffContextLine" foreground="#ffffff" background="#7f7f7f"/>
  <style name="DiffSourceLine" background="#d7d7d7"/>
  <style name="DiffSourceChar" background="#afafaf"/>
  <style name="DiffDestLine" background="#d7d7d7"/>
  <style name="DiffDestChar" background="#afafaf"/>
  <style name="Doxygen.Comment" foreground="#808080"/>
  <style name="Doxygen.Tag" foreground="#808080" italic="true"/>
  <style name="Field"/>
  <style name="Function"/>
  <style name="Keyword" bold="true"/>
  <style name="PrimitiveType" bold="true"/>
  <style name="Label"/>
  <style name="LineNumber" foreground="#c7c4c1" background="#efebe7"/>
  <style name="Link" foreground="#0000ff"/>
  <style name="Local"/>
  <style name="Number" foreground="#3f3f3f"/>
  <style name="Operator"/>
  <style name="Parentheses" background="#e3e3e3" bold="true"/>
  <style name="Preprocessor" foreground="#5b5b5b" bold="true"/>
  <style name="RemovedLine" foreground="#a0a0a4"/>
  <style name="Static" italic="true"/>
  <style name="String" foreground="#636363"/>
  <style name="Text" foreground="#000000" background="#ffffff"/>
  <style name="Type"/>
  <style name="VirtualMethod" italic="true"/>
  <!--
  Relying on default colors for:

  CurrentLineNumber
  DisabledCode
  LineNumber
  SearchResult
  SearchScope
  Selection
  Occurrences
  Occurrences.Rename
  Occurrences.Unused
  VisualWhitespace

  -->
</style-scheme>