Lens and Pens by Sally has a Phoneography Non-SLR Digital Devices Photo Challenge:
Nature is the theme this week.
Captured (only visually) on the Nexus 4. Slightly adjusted in Picasa.
More entries for this challenge here
Sally also has a link to tips on low key photography which I tried to integrate on the following photograph, previously posted here on this blog:
Capturing nature on my smartphone is something I like to ponder about