Kvantum is an SVG-based theme engine for Qt, tuned to KDE
and LXQt, with an emphasis on elegance, usability and
practicality.
Kvantum has a default dark theme, which is inspired by the
default theme of Enlightenment. Creation of realistic themes
like that for KDE was my first reason to make Kvantum but it
goes far beyond its default theme: you could make themes
with very different looks and feels for it, whether they be
photorealistic or cartoonish, 3D or flat, embellished or
minimalistic, or something in between, and Kvantum will let
you control almost every aspect of Qt widgets.