/usr/share/k3b/pics/crystal/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 | Author=Everaldo
Backgroundcolor=139,153,222
Foregroundcolor=255,255,255
Comment=The cool crystal theme
Version=2.0
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