My modest proposal for a September challenge (which would meet what I love to do) is that participants submit a photo they have either posted before or have never shared. The magic in the challenge is that you have to feel like you have improved it using Photoshop/Lightroom etc.
Ideally you would share a couple of the steps/concepts you followed to improve your image.
I've found real insights digging into old photos I had previously ignored and then worked on making them presentable .... even excellent. The joy in this is that one doesn't have to feel at all guilty using an old image!!
What do you all think? Gulp, I've never proposed a challenge before