Have just entered the latest CG challenge over at CG society.org. This one has the topic of Secret Agent. Its a pretty open brief and seems like a lot of fun.
You can check out my progress thread at http://forums.cgsociety.org/showthread.php?postid=5928806#post5928806 .
Here's the first two really early concept sketches i've scribbled down as i'm trying to collate some ideas.