First, I found a photo I liked of a nice woodland scene:
Then I added a plain coloured gradient on top:
Next, I added a few small swirling hexagons:
Which gave the photo a different feel already:
Then, I added the larger hexagons:
And the imaginary roses begin to appear:
The images in this post have been colour-popped in Windows Live Writer to make them more vivid. And the imaginary roses came together in PowerPoint and over on Beyond the Sphere before that.