Unforunately there is no SVG
release of my favorite icon
theme Nuvola yet for KDE.
But there is one for GNOME.
So I've repackaged the icons
for use in KDE.
Some icons (close, zoom, ...)
were missing so I created them
by recombining parts of existing
icons. Warning: This is a 0.1 release and ongoing work. But the cool fact
about SVG is that it brings open
source principles to the icon world,
because anyone can create new icons
based on existing ones.

DISCLAIMER:
This is NOT my work, I've just
repacked it. Search for "Nuvola"
to find the original (PNG-based)
theme here on KDE-Look.