I think I've found another use for Teleporter Stones. Travelling long distances! (Duh!)
If you have both of them in your backpack, you can throw one else where at use the other to warp there. Useful for getting on top of obstacles. What you can also do is press CapsLock, scroll to the other side of the map or where a teleporter platform is, throw the Pyramid there, wait approx. 20 seconds, depending on the distance (you'll see the Teleporter Stone fall out of the sky and appear on the ground), and use the one in your backpack to warp there. You can throw them over most obstacles. Only buildings and some hills block them. Don't forget to turn CapsLock off again.
This actually saves quite a bit of time, and saves dodging inbetween trees and hills.