To be creative you have to keep your inner child alive. Mexican photographer Felix Hernandez Rodriguez is a grown-up who's never stopped playing. He creates his majestic photographs including small toys.
A practical guide for those who love photography, but find it to be Greek :) Here is comparison chart so you can see what each aperture looked like. Knowing what your aperture will give you helps a lot when it comes to visualizing a shot.
Natural lighting cheat sheet: front, side and back-lighting illustrated to show how the direction of light can create different moods and effects in your outdoor photography. Nice visual for lighting concepts.