I made a folder a while back containing different capx examples of fake, pseudo and real 3D, created by others. I added some more today for this thread.
https://www.dropbox.com/sh/ijd8ze5okysi ... 3yTba?dl=0
Essentially you can make "3D-like effects" and even actual 3D with plug-ins. If you're good at math, I bet you can make pseudo 3D stuff. I think the paster capx is very cool, looks like it can help you make a 2D sidescroller with some 3D graphics. I think I've seen another overhead GTA style project on the forums that looked really great!