Iris KDE Aurorae theme is flat colored window decorations based on the Materia Aurorae theme for the Iris KDE flat theme.
Click on the screenshots for better view and to remove blurriness.

This is two Aurorae themes because the theme has two color schemes so I went ahead and made window decorations for both.

Theme color scheme is here:
https://www.pling.com/p/1314866

The Plasma theme is here:
https://www.pling.com/p/1314870

The original Materia Aurorae theme is here:
https://store.kde.org/p/1229137

Wallpaper in screenshots is from Charlie Henson here:
https://www.pling.com/u/charlie-henson