I had made up my mind that whatever I shot for 'Grey' would be grey and not a monochrome version of something colourful. This is the one I like the most.
Edit:
Square crop
Smart Sharpen*
Contrast boost
Exposure boost
Highlight recovery
Cloned errant fibre
Partial desaturation of green, red and magenta
*In Photoshop CS4; all other adjustments in Aperture 2
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