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I don't have many Ideas at the moment, this is more of a shameless attempt to get you guys to give me yours.
1. Encountering/having to deal with a tribe of Morlocks or other denizens of the deep, who regularly sacrifice slaves/prisoners to their Lake-God that is actually a Living Lake
2. A cave that contains the old but deadly Remorhaz plus Brown Mold - combination
3. Encounter a group of Darkfolk slavers with a broken wagon/in front of a cave in/some other form of travel impedement and be forced to decide wether to ignore them, try to free the slaves or help them for a reward (preferably information or something else that can't be taken of their dead bodies if the players decide to attack)
4. The rock changes into another type of rock
http://www.ragingswan.com/10-notable-cavern-features/
http://www.ragingswan.com/20-things-to-discover-in-a-cave/
http://www.ragingswan.com/20-things-to-find-in-an-abandoned-mine/
5. There is water dipping into small pool
http://www.ragingswan.com/20-minor-effects-of-drinking-from-a-magical-pool/
6. Statue marks a road or grave
http://www.ragingswan.com/20-secrets-of-dungeon-statues/