The other day I dreamt of a Doom level with really cool architecture and 3D floors, but even if I was a Doom mapper I can see that being a pain in the ass to make.
You can never make things exactly as you imagined them, can you?
And it would also require a decent computer. My laptop's CPU would incinerate if I started to mess around with 3D floors. It can barely handle Doom Builder 2.