A few themes for QtCreator
Commands for finding your system qtcreator installed themes,
find /usr/share -type f -name *.xml|grep qtcreator
find /usr/share -type f -name *.creatortheme|grep qtcreator
cp styles/*.xml ~/.config/QtProject/qtcreator/styles/
cp styles/*.xml /path-to-qt-bin/Tools/QtCreator/share/qtcreator/styles/
cp styles/*.xml "/path-to-qt-bin/Tools/Preview/Qt Creator <version>/share/qtcreator/styles/"
sudo cp styles/*.xml /usr/share/qtcreator/styles/
If you want qtcreator dark theme, pick one of them depends on the sort your installation.
cp themes/*.creatortheme ~/.config/QtProject/qtcreator/themes/
cp themes/*.creatortheme /path-to-qt-bin/Tools/QtCreator/share/qtcreator/themes/
cp themes/*.creatortheme "/path-to-qt-bin/Tools/Preview/Qt Creator <version>/share/qtcreator/themes/"
sudo cp themes/*.creatortheme /usr/share/qtcreator/themes/
Also, for dark themes you could change TODO panel color scheme by replacing [TodoPlugin] section in
vim ~/.config/QtProject/QtCreator.ini
file with content of the todo-dark-colors file.
For Qt Creator 3.0 and below, remove line which starts with <style name="PrimitiveType" in .xml.