Heres a repost of a shot I did a while back, here I converted it to black and white using the calculations method. I really like the detail captured in this shot, and the different, subtle shades that play upon the varying surfaces.
Ah, having fun with the channel mixer in Photshop. Try it out yourself. Select the "Create fill or new adjustment layer" icon at the bottom of your layers palette, select "channel Mixer" and use these properties: Red -50, Green +200, Blue -50. Turns all your green leaves and stuff into gold.