Mathias Pederson's "Starry Night", which Mathias revealed on the forums a little while back, is an amazing display of talent. The image alone is probably worth it's own post, but Mathias went a step further and put together three amazing tutorials on how he created this gorgeous image.
From the thread:
The image is based on the feeling of awe when one looks up into the big and beautiful night sky, full of stars. The mystery and wonder of life's greatness. The piece is starring this little redhaired boy, looking fascinated up into the huge sky - at that moment realizing how small we all are compared to the world, and universe, around us. I've experienced this myself, outside late at night, looking up into the big starry and cloudless sky. It's beyond compare.
Mathias's main site can be found here, and the tutorials can be found here. There are three intermediate level tutorials that cover Modeling, Textures & Materials, Lighting & Rendering, and finally Compositing, Adjustments & Final Touches. Mathias also has a beginner level tutorial on animating eyeballs using the Track To constraint.
Great tutorials, beautiful image.