by garygnu
As for homebrew...Venoc, Arnoc, and Elite Onyx Vipers- They could be rationalized with Vanestra's evil magic as Black Guards turned into snakemen.
Venoc Warlord- Makes a villian.
Marro Hive- It could be used as an underground spider's nest.
Feral Troll and Ice Troll Beserker- might work if you don't mind upping the fantasy, as a troll's size is variable in folklore.
Ogre Warhulk- Another kind of Troll.
Ogre Pulverizer- Ditto.
Anubian Wolves- I see them as possible feral rats.
Krug- Could work for the same reasons as the Feral Troll.
Marrden Hounds- Kinda look like rat skeletons.
Various Kyrie warriors- A bit of a stretch but they could be explained as a martial sect of pixies.
Minions of Utgar- Could then be used as an evil version.
Tealord and Runa- Villians to lead the evil minions.
The Einar Imperium and Empress Kiova- Could also work, maybe as nature spirits.
Ki-Mo-Shi- Arachnid looks are appropriate for a monstrosity of Venesta.
Rechets of Bogdan- They are plain scary, useful for a darker story.
Marcu Esenwein- Even scarier. Perhaps they both could be fluffed as imps or fiends.
The Dumutef Guard- Works great as a rat abberation born of foul magic.
Braxas- I like her as a dragon because of serpentine body and butterfly-like wings. Both qualities work on a small scale, IMO.
Gurei-Oni- Weird enough to work as a tiny demon of sorts.
Torin- Same goes for this one-eye.
Wo-Sa-Ga- A shoe-in for a snake monster.
Sujoah- fits well with the spider/roach/centipede-vermin theme.
Obsidian Guards- Hot Lava Fun! comes in many sizes. Elites.
Granite Guardians- Same idea, but cooled down.
Shurrak- Obsidian/Granite villian.
Fyorlag Spiders- Change the special rule for variety.
Fen Hydra- More snakey fun brought to you by Vanestra.
Sahuagin Raider- Nice lizard man brought to you by the dark arts.
Greenscale Warriors- More lizardmen to be led by the elite Sahuagin.
Rogar Dragonspine- He could be a lizardman villian.
Air, Earth, Fire, Water and Greater Ice Elementals- Magic comes in all shapes and sizes.
Wyvern- Kinda looks like an evil bat monster.
Iron Golem- A villian in miniature, perhaps a toy gone bad.
Heirloom, Siege, and Warforged Soldiers- Mechanical toys given magical life.
Werewolf Lord- Possible rat monster.
Mezzodemon Warmongers- Insect theme and demons make these usable.
Yep--a few.