The idea here is that there are parallel Great Wheels out there, all different than the others. Sigil might be different as well, and perhaps there is no Lady of Pain or perhaps there is another guardian of the city or perhaps She was killed eons ago and Sigil is a smoking wreck.
In whatever format you like, feel free to post some ideas of alternative Wheels, factions of the Metaverse (all the Wheels taken together), personalities for metaversal characters, items, places, etc.
My first example will follow below.
edit: Probably best to refer to "our" Multiverse as "Multiverse Prime".
Parallel I - Inner to Outer, as Below So Above (from here)
Sigil is a forest whose edges are bordered by mist. To walk into the mist is to wander into an unexpected plane or possibly even another Wheel.
The Lady of Pain exists here - debate rages whether the Lady is ultimately extant in every Wheel in varying forms - in the blade-haired, flaying shadow form we've come to expect. To be mazed here is to become lost in a thicker section of a forest only to realize there are no longer any portals.
In the place of dabus, Sigil and the Lady are attended by the silver walkers - sculptures roughly woven together from refractions of moonlight. There is a city but it is an underground somnucropolis - all the residents of the city are a mysterious race akin to slender, silver-white mercane that are fast sleep on beds of stone. The roots of the trees extend into the flesh of the Sleepers and gain nourishment from their dreams. As a result of this the trees seem to whisper through their leaves and bark.
The silver walkers attend the trees - pruning, watering, plucking the dream fruit. The trees do not all blossom and bear fruit at once, each seems to have its own particular season and its own particular fruit. No one is sure what the silver walkers do with the fruit, but what is interesting is that they will not stop you from eating anything off of the branches - to eat the fruit is to go mad from the great dreams of the Sleepers. The realities in the Sleeper's dreams are so much more real, and so much more beautiful, that one cannot help but feel lonely and lost when forced to return to a world of lesser substance and emotion.
Portals here work by burying a key into the soil around a particular tree. One key works for a party, as it makes the people around the roots of the tree sink into the soil. After a few moments of wet darkness you find yourself at your planar destination. The forest has rangers and druids who help travelers find the tree they are seeking, though magic items (maps, dowsing rods, compasses) and spells exist so that one can find their own way around.
The forest is a largely empty place that seems to shift size. There are animals here, but they are rarely seen. Darker, more dangerous predators do lurk in the thicker parts of the forest. Due to the protection offered by the Lady from the elemental dominance, there are also many exemplars who've taken up residence in the branches of the larger trees as well as in the underground city of the Sleepers.
The Outer Planes here have been conquered by the elementals and elemental-kin, and under their rule alignment exemplars have been blinded and are used as currency. The blinding process varies between elemental nations and planes of origin - burning, dessication, freezing, flesh to stone or jewel, vacuum exposure, and impaling are but a few possibilities. Interplanar traders keep these extraplanar natives inside soul gems and similar devices. The elementals seem largely unconcerned with the travels of mortals, but anyone attempting to help exemplars outside of forest Sigil is tortured, imprisoned, and oftentimes killed or enslaved.
Given the vast size of the Outer Planes as well as their very nature, pockets of resistance are continually forming on the Outer Planes due to the influx of petitioners from the Prime, though most are claimed by the realms of the various gods. The war between elementals and exemplars resulted in the death of many gods, so the Astral here is more crowded with god-corpses than it might otherwise be.
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