Normally when you are creating a High Dynamic Range picture, 3 or more images that have been taken at different stops are blended to create 1 photo with all the color and light as the original 3. The effect is stunning if done properly. This instructable features a simpler way to create the effect of an HDR image, using only 1 photo. This is not a true HDR, but it creates a very similar effect. If you have an iPhone running on iOS 4.1 or higher, there is a feature built in that essentially does this.
Photo 1 and 2 are from a hike I took last year.
Photo 3 and 4 are of a building in San Francisco.