Little fishes
If you have the space for a pond then why not populate it with pretty fish? You can pick from hundreds of different species, all with their own unique colors and patterns. Depending on the size of your pond you could raise some sizable new pets.
If you have people to visit then they’re a fantastic talking point, and if you have children they can be a great opportunity for learning responsibility as they help take care of your aquatic family members. Just remember to add some safety measures if you have very young ones wandering about.