SwampWater Live Wallpaper by Single Cell Software is a free personalization app that creates a microscopic world on your Android phone. It features squishy critters that swim around and interact with each other in random ways. This app was written for fun as the developer's first Android project, which is why it's free and has no dodgy permissions.

SwampWater is easy to install and use. Once you install it, you can set it as your live wallpaper. You can also customize the settings to change the number and speed of the critters, the depth of the water, and the color of the background.

Overall, SwampWater Live Wallpaper is a fun and entertaining app that adds a unique touch to your Android phone. It's perfect for those who love nature and want to have a microscopic world in their pocket.