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Start with a new grayscale image.
Apply Filter>Noise>Add Noise...
Use a value of 999.


Apply Filter>Blur>Guassian Blur
Use a value of 3.


Image>Adjust>Auto Levels



Filter>Stylize>Diffuse
Select Darken Only and
apply four more times (Hit Cmd-F 4 times.)



Change the mode to RGB (Mode>RGB Color.)
Then Image>Adjust>Hue/Saturation...
Check the Colorize box.
Use a value of 40 for the Hue and
value of -20 for the Lightness.


Change the hue for more of a bone marrow look. You can now create realistic looking hollow-cell textures.

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