Photogrammetry is a technique for constructing geometry and diffuse texture from photographs. It's a really exciting technique for asset creation because it allows anyone with a camera to create high resolution assets for games or film. Here's a rock I scanned. I'll write a tutorial once I get the process really dialed in. I'm already used this technique to generate the landscapes for my latest film.
UPDATE: Not content with a mere rock, I went to Fort Funston this afternoon because I knew the coast was overcast (best for photogrammetry) and captured a sewage outfall!