Ideas for the future

Encounter Ideas
make the floor slippery

skill challenges

lake or river of lava with rocks appearing and disappearing (appearing also with cold damage or melting with fire damage)

hold the line style fight-defend the NPC or the ritual caster PC while they open a portal or some shit against waves of dudes

I need to give the PCs a ship somehow and let them sink money into it, then pilot it with one person making skill checks

large boss monsters (especially clockwork leviathans and shit) that are mechanically multiple different monsters - http://thechamberofmazarbuldnd.blogspot.com/2014/01/mazarbul-bestiary-iron-sea-lobster.html

Chase scenes a la http://thechamberofmazarbuldnd.blogspot.com/2014/04/improvised-chases-system-neutral.html

Quest Ideas/Episode Hooks
Our heros are tasked with the retrieval of a magical item from an island stronghold. Time to go get that ship of theirs!

NPC Ideas
A dude (either unusually small or unusually large) with a LOT of weapons (and maybe two suits of armor). Maybe he turns out to be a badass, but maybe he has a glass jaw and can't take a hit.