/etc/X11/app-defaults/Xmessage-color is in x11-utils 7.7+2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#include "Xmessage"
*background: gray85
*foreground: gray15
*Scrollbar.thumb: vlines2
*Scrollbar.width: 14
*Scrollbar.foreground: rgb:a/5/5
*Scrollbar.borderWidth: 0
*Scrollbar.displayList:\
foreground gray90;\
lines 1,-1,-1,-1,-1,1;\
foreground gray60;\
lines -1,0,0,0,0,-1
*Text.?.cursorColor: rgb:d/5/5
*Text.borderColor: gray80
*Text*background: gray96
*Text*Scrollbar.background: gray80
*Text.displayList:\
foreground gray90;\
lines 1,-1,-1,-1,-1,1;\
foreground gray60;\
lines -1,0,0,0,0,-1
*Command.highlightThickness: 2
*Command.internalWidth: 5
*Command.internalHeight: 3
*Command.borderColor: gray40
*Command.shapeStyle: Rectangle
*Command.background: gray80
*Command.displayList:\
foreground gray60;\
lines 1,-1,-1,-1,-1,1;\
foreground gray90;\
lines -1,0,0,0,0,-1
*Form.displayList:\
foreground gray60;\
lines 1,-1,-1,-1,-1,1;\
foreground gray90;\
lines -1,0,0,0,0,-1
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