From Electric Fluid Entertainment:
Interactive water drop simulation that has the ability to choose the reflective environment as well as the background. The water reacts in many ways to the orientation of your device. The orientation effects how the drops fall as well as how they bend and reflect light.
Features: Touch to add drops. Water falls according to the orientation of the device. Water refracts the background and the device's orientation effects the refraction angle. Water reflects the chosen environment image and the reflection direction is effected by the orientation of the device. You can change the background by choosing from one of the included images or by using your photo library or camera. You can change the reflection environment by choosing one of the included images.