[Roger Dean]: He did all those great, funky album covers of Asia, Toto, Boston, Iron Butterfly, etc. An inspirational artist (Modular organic architecture along Bottom lines, and very cool animal-shaped robots.)
[Brian Froud]: Concept artist behind some of Henson's later works. Lots of very friendly faces that would be scary elsewhere.
Grandville: 19th-century French illustrator. Caricatures and fanciful, allegorical anthropomorphized everything, including [insects], plants and [steam-powered musicians]... [1][2][3]
Marcus Gray:
[Maya Lanski]: Gorgeous rubber-fetish jackals in a pseudo-classical science fantasy setting.
I'm stunned these haven't attracted fan characters yet. We'd bend the "media references" rule for something like this. They were probably also a subliminal influence on the Strange Medical Corps. -- OR
[Steve Stone]: Eldritch cybernetic pinups. Also did a biotech dystopia RPG called [Zero] with heavy D/s overtones. Direct inspiration for Strangewarp's cybernetic moon.
[Survival Research Labs] - crazy violent machine performance art ("the most dangerous shows on earth"). Heads up, Downwarpers.
[Oil Refineries] provide a sort of natural beauty of science and industry.
[The Chrysler Building] provides essential Art Deco style, especially the Lobby, useful for references for Up (especially if mixed with Top), or as a base for buildings in Down.
[Frank Gehry]'s work veers from starkly modernist to gleamingly biomorphic to cartoonishly surreal and askew. It would probably be possible to drop at least one of his projects (only a few listed on this page) into each Warp without creating any aesthetic disharmony.
[Palace Depression] was/is going to be again a Downwarper's sort of paradise, a whole castle made from a junkyard in the Great Depression era. Resonates Down and Charm.