Alright, last image unless I forgot something. Here is a leaf, reconstructed
from a digitized skeleton leaf I found on the 'net. (You can make skeleton
leaves by soaking freshly plucked foliage in washing soda, or so I hear. I used
an image search.) A few versions of the skeleton leaf--blurred at different
levels and combined--will produce the bump map for this. (Better yet would be to
use something like Crazy Bump, which is easier. Oh well.)

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