Rebecca Chernoff just posted about a new Stack Exchange feature: SE-site-specific blogs.
It seems to me that, with all of the photo blogs out there, there's plenty of good topics to write about. (Heck, we even have a highly-upvoted question dedicated to photo blogs.)
Of course, that may also mean that there's market saturation -- but personally I don't think that's the case. Even if we just replay the photo-of-the-week from the header, I'd say it's worthwhile.
Rebecca's first step in getting a SE blog is "Raise the idea on the child meta." Check.
Her next step is "Define the scope and purpose of the blog." I'd say that, if the idea itself passes muster (as determined by the comments & votes here), then we could create a new question to define the scope.