Zak S had a really cool idea that never got finished up: to have tables where you could roll a quick entrance feature or encounter as the players start to explore a ruin you haven't got prepared, together with a purpose and history for that thing that would give you something to latch onto in improvising further content in that adventure. He also suggested that it might work well as a deck of cards.
The main way I want to tweak this is to break the purposes down into Openings and Obstacles. That way, you could take each card straight as it reads, or add variety by drawing one card and then drawing others until you found a matching card so that the purpose can be mixed-and-matched with the description. I also am going with more detailed descriptions of the features to make it easier to use as a "quick, need ideas" generator.
As with the original idea, the texts assume you have determined by some other means who the original Architects and current Inhabitants of the ruin are. Monsters, Vermin and Intruders may also make an appearance ... perhaps to be determined by some other deck?
A couple of examples below. Don't know if it'll amount to anything, but I figured I'd test the waters and see if there is an interest for this.