Here's a map of the system our unfortunate Mechanicus and Psyker found themselves marooned in, 40,000 light years from the Empress and Sector: Throne...(click to enlarge)
And yes, all the names mean what you think they mean.
It's a mistake to believe that the first generation of moguls, who escaped the cruelty and poverty and tyranny of life under the czar or king or emperor, left that world behind. Rather, they brought that system to the new world and cast themselves - at last, the dream realized - as the monarch, Mr Big. In the land of the free, they fashioned a city-state where medieval powers existed, and to go with it they invented a cult that was close to the idolatrous nature of religions before the age of reason and science. So their Hollywood was intensely un-American, if you're thinking Jefferson and the Bill of Rights and the code of independent intellect. Hollywood was a harkening back to despotism, slavery, and a belief in the divinity of supernatural monsters. Every fourth year a Dole and a Clinton* feel the need to woo, warm and co-opt Hollywood, while any halfway intelligent politician must realize that the movies are - in their appeal to unreason and unreality, in their excitation of desire and instability, in their worship of power and glamour - the most abiding, virulent virus in the American organism.
-from "20 Things People Like To Forget About Hollywood" by David Thomson
(I have edited it to include some material that was cut from the original book--"Beneath Mulholland", one of the best books written about the city I live in).
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*Obviously out of date, this would now say "A Bush and a Clinton". My how things have changed.
The original Imorph is not plastic-surgery software from microsoft, it's a sort of changeling that slowly copies you in combat. Which would be clever if there wasn't already the enveloper and changeling. So this one imitates everybody in the area simultaneously:
As should be clear from my picture, while waiting to strike, it hides on the bottom of skateboard decks from the early 1980s.
And now, I talk about to some people about graphic design:
The hoar fox has one of those names like Jonson the Hammer that probably sounded real flash in 1292 but now just sounds like some troglodyte troll blogger's attempt at a bad pun. Not a bad monster though--icy fox monster. Sure, why not? To distinguish it mechanically from a winter wolf and things like that I feel like it needs a better thing than frost breath, though.
(The scale is goofy: little animal, big cone of cold. Too Looney Tunes.) Starting with how that guy said a fox hunt is supposed to be "The unspeakable in pursuit of the inedible" let's say the White Fox tricks polar bears and giant lynxes and other polar megafauna into eating it. These animals then freeze to death from the inside out because of the iciness of the fox, and then the clever fox eats them. Suck it, borealan apex predators.
I think they meant to call it the Hook Fucking Seriously Fucking Really Why? Fuck You We're Not Trying. Like idiots, they keep using it even now:

The secret horror technique I have ingeniously employed here is to not make the monster look like the fucking buzzard from Woody Woodpecker.
The Hound of Ill Omen is another goddamn dog monster, though, to be fair, it just shows up and portends doom and leaves, so it's not just another demon dog/hellhound/barghest. The mechanics could be handled better than in the Folio, plus it doesn't give a compelling reason the hound is there in the first place, but this is all doable: tie the appearance of the hound to the PC actually doing something and tie the doom power to an ill fate. I -no plug intended but it's unavoidable here- suggest using a variant on the Fortune system in Vornheim for the dog's curse.
Now the Huecuva as presented in the Folio is just Another Fucking Skeleton. But thanks to this Dragonsfoot thread I know it's supposed to be some kind of MesoAmerican monster. Which is fine because there aren't really many good D&D monsters in this semiTecumelian vein. So I sent it to Pre-Columbian Ecuador for some redesign work...
...as for mechanics, it'll need something better than just "hey, maybe you got a disease". I'm thinking a curse where every time you kill something it comes back to life as a zombie and keeps trying to kill you and you can only stop it by destroying the huecuva.
2. Grab a number of dice (any standard dice) approximately equal to the number of interesting rooms you need in your dungeon.
3. Grab a red marker and make a box around every square a die landed on, like so. Also: draw lines connecting these rooms.
...read what came up on the die sitting in that square.
Garbug. Garbug? Fuck you Fiend Folio "G" authors. Galltrit, Gambado, Garbug? Oh no! The Garbug! Fear it! Fuck. Goddam egg-sucking soccer hooligan waterheads wrote this thing. Anyway: half bug! half lobster! The black variety does something lame and the violet variety does something also lame.
It is now called a Gurgler and it's a foot long and it's like a little Igor and it helps evil wizards and alchemists carry out experiments by like taking measurements and handing them shit. "Clawing" I guess. Its unique attack is if you put a substance into the glass jar fused to its back then its saliva can replicate the effects of said substance.
Mountain Giant...
I'll be the first to admit the Mountain Giant looks like a big Galeb Duhr but there's only so much that can be done with these "G" Fiends.
Gibberling these are like some grubby humanoids with some hit dice and stuff. They make some noises, I guess, which is supposed to make me forget I need more gross subhumans with clubs like I need a hole in my...AAAAH! I'm doing it too, the cliches the CLICHES!!!! fuck. My brain. Ok, calm...The Gibberling is now this:
It is an intelligent relative of the Shrieker, it speaks most local languages, is saprophytic and telepathic. It reads the PCs thought and--rather than shrieking--simply tells passing monsters everything it knows about the PCs so that they'll kill them and the gibberling can eat their rotting flesh. Occasionally a gibberling can be convinced by PCs to give them info on monsters so, y'know, vice versa...
Their less-interesting-cousins the Githzerai need a redesign. They're supposed to be kind of like monks, ok...
The goldbug is a poison bug that looks like a coin. Let's make it a bug that eats coins..
...or we could make a version of it that's inspired by the Edgar Allen Poe story and make it a bug that's really fucking racist.
Gorillabear. I lack the energies of disgust the gorillabear deserves here. I'm calling it Grendel and redrawing it slightly and moving on...
The Grell just needs its stupid beak removed:
Now the Grimlock. The original grimlocks were indistinguishable from gibberlings only quieter and blind. They should never have been invented. However, the word "grimlock" is good. Here's a new one:
The original Gryph is just a crow with a lot of legs with a laying-eggs-in-you trick stolen from Alien and the giant bluebottle fly in this very folio. Reeeeeplaced:
It's hard to argue with the concept of Guardian Demon though the mechanics they give it are some dumb fire powers. Here's a new picture, the rest I bet you can handle. It asks riddles or curses you or makes your entrails try to crawl out of your nose or something:
Last up we got the Guardian Familiar which (good news) is a cat with nine lives, each a hit die scarier than the last, but which (bad news) is just a cat, really. I decided that each cat is inside one of those Russian dolls and inside each cat is another Russian doll with another cat in it.