I love breedables in Second Life. I love collecting them, breeding them and creating them.
In the past I wrote XS Cactus and XS Quails (which I released as opensource, and has been used in many breedables since).
Focusing in budget friendly pets I’ve made breedable bunnies, frogs, turtles, dragonflies, spiders, serpents, unicorns, flutterbugs, shroomies and more.
I also have a garden system (reproducing flowers) a fishing system, and a farming system (to grow pet food!)