I found this leaf on my ride home today. It stood out because it was standing up perfectly straight, and it was pale yellow/green while most of the other leaves from the same tree were red.
I took it home and set it up like you see here - a tea candle is providing the backlight. After playing with the color, it seemed B&W was a better choice.
[last year] nice curves...
backlitcandleleafplantveinnikon d6002013black and white