er!... a yellow rose on blue background!!!
Not much of a title I know, bored and snowed in again!!!!
Time to get out the large sheet of black acetate that lives under the bed.
Great old trick I’ve used before and well documented in the book Light Science and Magic.
Put a white piece of card at the end of the sheet of acetate and snoot and gel (this time blue) a flash and aim it at the white card. The blue spot on the white card reflects off the black acetate back to the camera (reflected Light)
Then added a white fill flash pointing away from the camera the white light reflects back to the camera off the rose (defuse light) and away from the camera off of the black acetate hence the acetate still appears black.
All lighting controlled by pocketwizards.
Why black acetate? Well it only has one reflective surface whereas a mirror has two, one from the top surface of the glass and the other from the mirrored surface on the other side of the glass.