Here are three more....
I was experimenting with a hand held flash light (or torch light) and realized the side of the flower is "over exposed" and
became white but due to long exposure the top of the flower retained its original color. I liked the effect it created, though
a thoroughly yellow color may not have been very interesting.
The orchid was an interesting challenge. I was experimenting with flash, flash light and flash with manually triggering the flash by pushing test button
etc. I could not find the right balance between white washing petals and clarity in the central part of the flower. Eventually I managed to get the best possible balance by not using any artificial source. I played with shutter and exposure with some post tweaks in light room. Though I removed other branches etc., no flowers were hurt in the process.
This particular one is an outcome of an oversight. I love the extreme colors and no it was not ham fisted post processing.
To start with it was 9 image bracket at 2 secs, and merged in Machinery HDR. But the preset was used was a preset I saved while
processing a landscape few years ago from Pismo Beach. The flash was on the flower above the flower, the burnt orange is the shadow
created by the light (front petals). I don't think I can ever come up with the color scheme I ended, even in my imagination.

ur/]