I'm in to play depending on the specifics. I can post as much as necessary now, but that could change depending on if anyone ever gives me a job. Don't know what I'd be playing - probably a Frogfolk so I could test it out, maybe a Rogue (Wilderness Rogue?) or something like that. By the way, here's a quick spell. I based it on sleep, but it seems a bit weaker (since the creatures affected aren't helpless), but it affects more HD worth of creatures and doesn't allow SR.

Swamp Fumes
Conjuration (Creation)
Level: Drd 1, Rng 1, Sor/Wiz 1
Components: V, S, M
Casting Time: One round
Range: Medium (100 ft. + 10 ft./level)
Area: All creatures in a 10-ft. radius burst
Duration: 1 round/level (or 1 minutes/level)
Saving Throw: Fortitude partial
Spell Resistance: No

This spells creates swamps fumes that emanate from the ground below the target area. Fumes continue to spew from the ground for one round per caster level, or one minute per level if cast in a marshy or swampy area. Creatures in the area when the spell is cast or who pass through the area as the fumes emanate in it must make a Fortitude save or be nauseated for 1 round per level. Creatures who succeed on the save are instead sickened for that amount of time.

Material Component: A pinch of dried swamp mud or dried skin of a ghoul.