I like this app. AG:
With Pixaloop, you can animate all kinds of element (sic) in your photos whether it’s a horse running through the field, steam coming out of your coffee mug, or waves in the water. It also lets you move elements in different directions simultaneously which you can use to create unusual and trippy effects like building tiles moving in a loop or a river flowing in both directions at the same time!
Check out the video.