I don't have any myself--I've just been putzing around in my game, so I don't know the specifics (like what triggers the ring to come in the mail, I'm assuming it's something that happens fairly automaticallly).
There are a total of 7rings you can get, one is for getting married, and one is for your birthday, I dont know the rest but i a guessing you get one from your aniversiry stuff like that. The rings apper above your character when you are in your stats. kinda like the crowns on animals if they win
ummmmmmmmm...i think i really don't know which side to pick, "They do nothing", or "they're like power berries". but if they were like power berries, wouldn't they want to take the power berries out? so they wouldn't have 2 things that were very similar to each other in the game? but then if you got like all the power berries and rings together, you'd have almost double your stamina points . so many good and bad things about this....you know, this would be a really good topic for a debate. and lucky me, there's a track meet tomorrow, so i'm thinking of all my poor pulled muscles .