Want to take photos of your aquarium, but from a totally different perspective? Try using a cell phone in a waterproof case. There are tons of different cases out there for a wide variety of smartphones, and many of them can be safely submerged in saltwater or fresh. Just drop your phone in and start firing away. You can even get a waterproof case for your point-and-shoot or DSLR camera, but these are a bit more expensive and only serve a single purpose. On the flip side, a waterproof phone case usually doubles as a heavy duty case for day to day activities, like when you drop it or let your sticky fingered child use it.