I've been looking at some existing campaigns, and here's a few I've taken a liking to.
I'm not overly keen on the layout used for the type, but I do like how they've used a photograph with a distinct depth of field. It's nice to see just a little area of the photograph in focus. It almost highlights the most important parts.
Again, I like the photography used for this advert. It's close-up and clear, which helps deliver the message.
Two photographs which compare or show the difference (though not in this case) is a really nice way of showing change (again, not in this case).
I definitely want to play with these ideas for my own work.