The downside? Well, themes can be limiting. I have captured some excellent images that I ended up not posting because they did not meet the theme for that week. Second: themes can be hard! As one of my Twitter followers said, it is difficult enough taking a picture every day for a year, but fitting it into a theme each week is just crazy!
So I am still undecided. If I do continue a weekly theme this week I was planning on doing 'things that make you go OOF." OOF is 'Out Of Focus' shooting. I often shoot with a shallow depth of field, intentionally throwing most of the image out of focus. I have always enjoyed this type of photography and this comprises a large percentage of my pics anyway, so perhaps it won't be too difficult and will allow me some time to decide.
The pic posted here is a fence near my work. I narrowed my focal point to a few inches and added serious vignetting in Aperture to add a moody effect. Kinda matches my cloudy weather mood of the past week. I need some sun soon!