Well, it looks like my image for the week of the 13th is likely to be 3rd place, at best, so... I'm going to go ahead and start off the entries for the 20th.
I thought I'd "heat things up" (pun intentional, feel free to groan) by doing something custom for this purpose -- a photo whose very intention is to be on the header of photo.SE. So, I figured I'd put "Photo.SE" in the image, somehow. My first thought was to try to somehow brand or otherwise inscribe that onto a match (I'd been thinking a match photo would be good -- I like doing them), but then I got another idea... a light stencil, placed atop the match with an optical trick.
Here's the result I got:
Please note that the main effect here (the text) was done entirely in-camera (there was a little bit of post, but just cleaning sensor dust and minor tweaks to crop, exposure, etc.).
The main concept has been with me for several days, but I'd like to give credit to John Cavan for giving me the last-minute idea to shoot it with the match facing downwards, thanks to the November 8th entry from his Picture A Day series, which I happened to check out, since his image is on the header bar currently (as I type this). I hope you don't mind, John. :)
So, no idea if this will take the week or not, but here it is, a custom-to-purpose image. :)