I'll state my problem straight-out. I have a 2d overhead world, and I desperately need to add a vertical element to it.
The main idea considered was making the obj/mob/turf larger or smaller depending on their elevation. The problem with this lays in that I feel it's just too inefficient to draw several copies of the same icon of different sizes.
Another suggestion was to either colour-code turfs according to their elevation, or make them brighter/darker according to their elevation. The first would make many turfs look strange, and the second eliminates lighting effects.
So, basically what I'm after is an interesting way to have a vertical element to a 2d overhead game. :)