You know the feeling. Orcs, goblins, ghouls and the rest of the Monster Manual - they are all known by the players the moment you start to describe them. Heck, you probably can't finish the ghoul description before the cleric in the party yells out "I turn them!"
In one of the episodes of The Brainstorm Podcast that we are recording tomorrow night, +Vincent Florio , +Glen Hallstrom and myself are going to be discussing "re-skinning" monsters in a campaign - methods to keep your players guessing. Sometimes it's as simple as making the ghouls cursed instead of undead - watch the surprise on your players' faces when the swarm of ghouls ignores that guaranteed "Turned" result ;)
Here's you chance to get your ideas mentioned on the podcast. Do you re-skin monsters in your campaigns and do you have any special methods or techniques for doing so?