(First small stone. I've not been sure what to do about photos while I'm doing this. It seems to me rather to be against the spirit of it: if the photo is linked to the small stone, serving as an illustration and/or a prompt, it's getting away from the aim of conciseness and immediacy of the writing, rather like drawing from a photo, but if I post photos that aren't related to the writing, it's also digressing and a distraction, and perhaps just a bit too much. However, I shall miss posting photos for a whole month, although I have been drifting away from taking as many.
The solution I've arrived at is to resurrect my long dormant Flickr account and commit myself to posting one photo a day there, which will get me thinking and observing photographically also, but in a different location. Then at the end of each week I'll make a collage of them and post them here. Hope that all makes sense!
OK, that's all; small stones only from now on, no other writing.)