/usr/share/themes/Ozone3/openbox-3/shade.xbm is in lubuntu-artwork-12-04 0.45.
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 | #define shade_width 13
#define shade_height 13
static unsigned char shade_bits[] = {
0x00, 0x00, 0xf8, 0x01, 0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00 };
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