/usr/share/themes/Ozone3/openbox-3/close.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 close_width 14
#define close_height 14
static unsigned char close_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x02, 0x38, 0x07, 0xf0, 0x03,
0xe0, 0x01, 0xe0, 0x01, 0xf0, 0x03, 0x38, 0x07, 0x10, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00 };
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