Avoid stereotypical material. We’re looking for new ideas or fresh approaches to old ideas. Even the most tired cliché can work with a clever twist. Here are some stereotypical adventure ideas; think twice about using them unless you have a particularly good twist in mind.
Rescue someone’s kidnapped daughter
Solve a murder perpetrated by a doppelganger.
Retrieve an ancient artifact.
Battle a deranged wizard or sorcerer.
Repel a simple humanoid infestation.
Defeat an undead army.
The above list is not all-inclusive.