I'm currently working with a pretty fantastic object called the Trans-Longitudinal Farporter (TLF). It's a ball made of several gold-alloy rings that spin freely in a gyroscopic way. Each ring has countless engravings on it, written in an ancient script, that describe an axis of the "globe," whatever that is. Each ring also has an embedded earth-gem in it - onyx, diamond, emerald, amber-opal, and some more rare gems. In the center is a glass ball that warps the movement of each ring, which seems to continue even when the rings are at rest.
The TLF transports objects and/or itself between two points in space. Unfortunately, it is based on arcane lore unknown to its creators - so its full potential has not yet been realized. But when it does transport something, it's usually a creature of some sort, and that creature appears in a small crater, as though the TLF were trading soil for life.
I don't know how you'd use this object, but as a GM, I'm using it for drop-in players and random encounters