When looking through the 802 "Iris" images at Acclaim Images.com this A Purple Iris Flower 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:
A Purple Iris Flower
Stock Photograph: A purple Iris flower

Some related terms for more images:
purple,  botanical,  horticulture,  nature,  beauty,  steven james haggard,  grow,  delicate,  purple iris,  selective focus,  plant,  vertical,  soft,  floral,  bloom,  flower,  close up,