/usr/share/afterstep/desktop/icons/greenbar.xpm is in afterstep-data 2.2.12-11.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | <gradient angle="90" width="1" height="23"
colors="#37605c #0a1312"/>
|