When looking through the 47 "Columbine" images at Acclaim Images.com this Aquilegia Canadensis or Wild Columbine 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:
Aquilegia Canadensis or Wild Columbine
Stock photograph of Wild columbine (Aquilegia canadensis)

Some related terms for more images:
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