Hi shane! What about something like "where I work"? It could be where you're employed, or where you work at your craft or hobby, or where you work out... stuff like that. There may be a theme suggested already though.
I like "Where you work" ! Especially if people interpret it personally or irreverently and have fun with it. It doesn't have to be a picture of a cubicle or an office building. For me it could just be pictures of a day's worth of companion animals at the vet.
If you're an artist (or an aspiring one in off-hours, like me currently), why not post a pic of something unfinished on your drawing board?
Since I dropped the ball and didn't post your "Bad ___ Day" idea last week, that one's still in circulation, too. (And that was the last one from the list of suggestions folks posted about a month ago.)
Another suggestion for the lineup: Stupid pictures of your feet. Seriously. You know that line in Lost in Translation where Scarlett Johansson talks about taking stupid pictures of her feet? Maybe it's just me, but that totally resonated with me. Whenever I'm really really bored I always end up taking pictures of said appendages.