I really love the concept of the eternal bonding rings which lets you teleport to your other half. So I recently started thinking, wouldn't it be cool to have something like that but for you and your best friend?
I would think friendship bracelets would be super cute to gift to your closest friend, and having a function to teleport to them too would be super useful. However if SE could think up of another function I would be open to that too personally!

What do you guys think? Are there any functions other than teleporting to your friend that you think could work?