
tbug |

Pathfinder Paper Minis put out minis for every single monster in the entire AP. That's a pretty impressive bit of third-party support.
I'm looking for mini-adventures to run in Saventh-Yhi. I don't want every scripted event to be directly tied to the meta-plot, but I also don't want to write everything else myself if I can avoid it.

Caedwyr |
You might want to look at Wayfinder #4. I believe there is a decent amount of material supporting Jungle-type adventures. There's also at least 2 weal-or-woe articles that provide the spark for a mini-adventure.

UndeadViking |

Check out the Grimoire Viperian from Magic Skull Games.
This book has quite a bit of snake-themed stuff in it as well as a ton of other material which can easily be injected into the Serpent's Skull AP to change, enhance or expand it.
The book includes:
- 22 new prestige classes, many of which are snake-themed (Serpent Warlock, Silent Adder, Serpentine Druid, Serpentine Necromancer, Python Master, Cobra Master)
- spells (just to name a few: speed of the mamba, serpent strike, virulent venom, summon snake swarm, summon amphisbaena, serpent whip...) and a ton of non-snake themed spells useful in any campaign
- monsters (deadly snakes and snake variants, half-serpents, sentient serpents, vampiric serpents, serpentine undead, creatures of primal chaos, trog trolls, trog ettins, xocoutls, viperian dragons, etc.)
- magic items (python scale armor, serpent spears, sorcerous helms, etc.)
- new concepts like Eldritch Path Feats and Supernatural Signs (especially the Sign of the Vile Serpent for this AP)
- There's also two new base classes, the Shapeshifter and the Pyro. The shapeshifter can assume the forms of animals (that includes snakes!) and the pyro makes for a good tomb explorer type of character. Or both could be memorable NPCs.

UndeadViking |

BTW, there's a 37-page free sample version of the Grimoire Viperian available, as well, to give folks a better idea of the kind of content within.
Look for the "Add Sample PDF: FREE" under the full PDF price.