I'm getting bored again trying to come up with pictures. So, I wondered if anyone might like to do a theme sort of thing?
For example, every Monday you've got to take a photo of a certain type of thing. The categories would be very general, and really open to interpretation. (ie. transportation, light, windows, circles -- anything, really!)
This isn't very well-thought out at this stage, just wondering if there's any interest. If so, we could make up our own rules. 
I'd definitely be up for this! Although, as ~E~ said, I might not stick to it. I mean, I might either find something spectacular that doesn't fit the theme, or else just not have the opportunity to find something that fits the theme. But it would be nice to have a sort of direction once in a while.
What about once a week? Like on a Thursday? THURSDAY THEMES! (I'm a sucker for alliteration.)
So why don't you start it off, Sevans, since it was your idea? Say you pick the theme and let people know by Tuesday? Wednesday? Is that enough notice for everyone?
Then we can either determine the order that people will pick in, or else the person choosing the theme can also choose who'll be choosing the next one.
Does that sound good?