Limbo?

No fractals; they're very firmly based in the very ordered land of maths (though they do have some odd properties).

I'm of the opinion that Limbo itself shouldn't change at all; pure chaos is pure chaos. Some of the locations in Limbo, however, could modernise if their inhabitants so chose.

Then again, I've got a feeling that they might be reuctant to do so. I see the Githzerai as being somewhat resistant to the idea of being enslaved by bleeding-edge technology, and selectively adopting mature technologies where it suits their purposes.

There should be a city of of constant change and hyper-consumerism, where marketing microfads exist for scant minutes and your social status is based on how far behind you are in hours. Only the god-star (the premiere) of this place is ever up-to-date on all fashions and trends.

Hell, take all of California! (cue propellerheads music)

You can program fractals to generate constantly varying dimensions. They still retain the properties of the law-abiding fractal in that they are always repetitive, but they illustrate the completely non-uniform basis of constantly changing quantum measurements which are said to reflect the flux of reality beyond the world of the subatomic.

A modern interpretation of Limbo might be much the same. Its patterns of evolving chaos are highly repetitive, but deep beneath that foundation of repetition is a quantum-verse of fractally connected dimensions that are (mostly) completely random. The subtle shifts are simply beyond the conception of entities who exist in the world of the large.