This shot from my gallery was done by putting the flower in a small necked glass and using the above technique. Exposure time was 15secs, F8, ISO50. I gave the flower one quick burst of light from the front in the centre, then worked around the outside shining the torch down into the petals and from underneath. I hope you try this, post some images, and enjoy experimenting with the intertesting effects as much as I do. Richard.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html