So in the off chance any of my players are on here I'm going to saying if you are playing as Cord, Paero, Marron, Vellie, or Turlen. Please turn back now.
So I've been building up to and hinting at a bad guy in my custom campaign setting for awhile. They are a worshiper of Lamastu and are actually 8 different people bound into the same form by a botched attempt at Lichdom. They did manage to become a lich but they wish to each be free and have their own body. To further this goal they are looking for an artifact and are using fleshwarped servants to do so.
So the question is what suggestions would you have for creative fleshwarped creatures of roughly CR 5-8?
TL:DR I need fleshwarped ideas or suggestions that aren't just templates or beastiary listed fleshwarps
Here's a list of known fleshwarped creatures, many of which fit into your CR range.
There's also an item crafting feat for fleshwarping, which allows you to modify exiting creatrues to taste.
What sort of setting are you envisioning to use these enemies? I'm assuming the main villain is probably powerful enough that these CR5-8 enemies are not meant to be its primary guardians?
I like the idea of the PCs having to wade through throngs of disgusting Grothlut fleshwarped creatures on their way into a stronghold or important location. They are relatively weak on their own, but seem more effective in numbers, and their moaning may also serve as a crude form of alarm.
Maybe have a Ghonhatine as a key bodyguard near the end of the scenario, especially if the individual they are guarding has immunity or protection against being nauseated.
EDIT: Depending on how you want to run things and how it fits your campaign, it could also be fun to present the PCs with a fleshwarped monstrosity (using some imagination and the fleshwarp crafting stuff) that turns out to be the remnant of someone once dear to the PCs. This would very likely focus the parties' efforts on going after the person/thing responsible...
The lich has pursued the artifact to a desert where an ancient civilization used to reside. The closer the PCS get to the ruins the more likely it is for them to encounter these creatures.
While not strictly "fleshwarped" creatures, there are lots of aberrations that fit the same mold as what you're looking for. I'd personally take an almost Lovecraftian approach, and have the PCs enter ruins filled with long-forgotten horrors best left undisturbed.
Maybe a chamber sealed with protective magics and runes, which contains Moits of Shub-Niggurath. A combination of the Slugspawn (CR5) and Spawning Canker (CR9). Perhaps they have been sealed off from time as a desperate means to contain their spread, and the PCs have now exposed the world to their horror if they cannot purge them. Or perhaps even worse, the chamber is already open when they arrive, and there are indications that the BBEG has taken samples...
As a possible final boss for the region, or even an enemy the PCs are meant to flee, I present the Gibbering Abomination, perhaps guarded or preceded by Gibbering Mouthers.
You could even just apply the Fleshwarped template to some more standard humanoid enemies, like a tribe of orcs (with lots of basic grunts, and maybe some leaders with class levels), combined with some Oronci. You might consider having the tribe as a whole be beholden to (or simply driven insane by) a Tentacled Horror. The upside is that your PCs will likely be safe from the Aura of Insanity, but it will still present an intimidating threat, especially with the support of its fleshwarped orc minions.