I don't want to see any usable futuristic items or anything that changes the feel in any meaningful way in Skyrim. However, having said that, It would be neat to have a quest, or see a dungeon or ancient ruin that hints at a future technological civilization (not necessarily anything to do with Fallout) or a current civilization from the stars. I'm not suggesting that we come across any actual future technology (unless it's maybe damaged and unusable) or even creatures from said civilization (unless they are corpses dawning damaged unusable technology or residing in a craft of some sort). It could give a cool ancient aliens feel in a single dungeon or ruin without changing the gameplay or the main theme of Skyrim's setting.
Just a thought experiment. What do you think?