When looking through the 520 "Orchid" images at Acclaim Images.com this Candy Stripe Moth Orchid In Bloom Set Against a Black Background was a favorite.
All of their pictures are hand picked, availiable in a number of formats, and you can even get custom prints and posters.

Description:
Candy Stripe Moth Orchid In Bloom Set Against a Black Background
Candy Stripe Moth Orchid in bloom, set against a black background to accentuate the pink blooms.

Some related terms for more images:
pink flower,  flora,  bloom,  botanic,  floral,  pink flowers,  orchideae,  pink orchids,  blooming,  bill horn,  botanical,  candy stripe moth orchids,  botany,