This was a very minor color correction and is difficult to accurately portray due to color shifting in my screen shot.
Go through each adjustment layer per RadiantVista tutorial:
Levels for highlight/shadow: eliminate voids at ends of histogram if needed.
Curves for midtone constrast: steepen curve if desired.
Curves for Color Balance: I used the gray eyedropper and clicked on a "neutral" area of petal. The correction was too extreme for my taste, so I decrease the correction slightly in each color channel.
Selective color: I saturated and darkened greens and yellows in the background that were reduced in previous step.
Added a PWL layer to vignette the border and brighten the petals.
Sharpened a final "stamp visible" layer, masked just the flowers and softened the sharpening with reduction of layer opacity.

forum discussion: http://forums.dpreview.com/forums/read.asp?forum=1006&message=23733848
original image by Shades UK: