I'm afraid I don't have any painting pictures to post today, although I've made some progress, our house is currently upside down as we are doing a load of renovation so getting a photo is more difficult that normal. Instead, I thought I'd point you in the direction of this that I came across in my standard trawling of the interwebs for 40K content (from someone elses link, although I don't remember where from so thank you whoever it was originally posted this). Its a pretty fascinating discourse on how game mechanics work, and their use in driving evolution in a game system, the fabled META that is always discussed, and of course sales.
http://penny-arcade.com/patv/episode/perfect-imbalance (sorry, can't embed it).
Its a pretty fantastic presentation of what could otherwise be a very complex issue, and I'd very highly recommend you take 7mins to watch it, and I'd love to hear what you think of it too.
Cheers - Andy