How to create your own Lumen Print:
Arrange some plant life onto black & white photo paper (old paper works well for this) & top with glass to slightly flatten the greenery. Leave it in the sun for as long as you wish. The heat the will cause the photographic paper to get moist in the area of contact with the plant. This process produces color shifts & as the exposure progresses the paper will darken.
After your print is created make a digital copy using a flatbed scanner or a digital camera. Open that image in Adobe Photoshop & enhance as much or as little as you like.
The Creating Process