KDE's Visual Design Group https://t.me/vdgmainroom | If you have questions or ideas, try to use our forum http://goo.gl/4vjhuk | Take a look at our HIG https://hig.kde.org | Want to create mockups? We have a mockup toolkit (vector based) http://goo.gl/mGFdnW make sure to read about our basic layout guidelines https://hig.kde.org/layout/index.html