/usr/share/k3b/pics/quant/k3b.theme is in k3b-extrathemes 17.12.3-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Author=Dmitry Novikov (quant@trktvs.ru)
Backgroundcolor=
Foregroundcolor=
Comment=New official theme for K3b. Enjoy!
Version=0.1
BackgroundMode=Scaled
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