'You find yourselves standing on a low platform surrounded on all sides by gently lapping water. The light has a twilight quality to it though you can see neither sun, nor moon, nor clouds of any sort in the deep azure sky.'
'The platform is dominated at the center by a low dais on which a quicksilver orb rests supported by an ever shifting base of what you can only describe as fluid bronze. Around the perimeter of the platform nine massive pillars stretch into the ethereal heights above you.'

I've been wanting to incorporate more handout imagery to draw the players into the locations a bit more. This piece took my fancy while I was surfing the web for images to incorporate, and after Danny mentioned Planescape I started brewing up some ideas. I used a teleporting map/war room years ago that i really liked the idea of even though the PCs never really made much use of it. So if i need a means of planar travel for them I may try to bring it back. you know, "have the nail build the house" sort of thing.

Right now I'm thinking of treating it almost like the Stargate meets Sliders. Left behind by 'someone' with links to almost anywhere and accessible to random people. I have a wild hair to have them run into encounters occasionally when they pop into it(some combat, some role playing). They could find one portal to it and explore more directions as they pleased sort of building knowledge of routes to different places.

For operation i'm thinking this:

Use Magic Device Check to arrive at:	DC
Specific Plane	15
Specific Region	20
City/Town	25
Teleport Style Accuracy	30

Activation Time: faster for Higher Int? longer for higher DCs

Intelligence Check to arrive at:	DC
Random Plane/Location	20
Home Plane	25
Home Region	30

Attempt Intelligence check activation 1/day? Penalty for Failure-Abil Damage?

or perhaps a nexus of ever shifting hallways, or perhaps the nexus alters its' visual properties constantly. The platform, to hallways, to barren desert paths, to empty city streets, to secluded forest trails, to...infinity.