The trinity desktop environment (TDE):
https://www.trinitydesktop.org/index.php
The TDE project began as a continuation of the K Desktop Environment (KDE) version 3. The name Trinity was chosen partly because the word means "three" and TDE was a continuation of KDE 3. TDE now is its own computer desktop environment project.
This is a bit like MATE/GNOME3 type of fork for KDE.
If you think that KDE3 was the peak for KDE, that KDE4/5 are over engineered and feel nostalgic, you should definitely try this iso.
This particular iso, is ubuntu LiveCD/Installer 16.04 64bits with standard trinity on top.
a youtube video
https://www.youtube.com/watch?v=9SCcTnyz_S8