My take:
On GIMP, I:
1) Cropped, to try and emphasize the diagonals;
2) Converted to B&W with channel mixer;
3) Added a bit of drop shadow;
4) Reduced contrast just a bit;
5) Used the "Retinex" effect to create texture; and
6) De-noised the sky, which became noisy when applying the Retinex effect.
That's it.
Very nice photo, windrider. Is it close to home?