Ripped some natural stuff from Hexen, and made some DECORATE objects, namely the "trees and rocks" generator for the skybox, which randomly spawns one of 10 generators, which in turns spawns one of 5 size variants of that particular sprite. Plop down a thousand of one actor, and get an automatic forest! It's even different every time the map is loaded!
This was originally a concept drawing thing that went too far. It's a location from a completely random set of ideas, the "Administration Tower" for this world's premiere evil corporation. I wanted to make a concept sketch to get some ideas fleshed out, but seeing that my drawing skills are sub-par and I could map anyway... this is the result. Hope it's interesting at least.
Oh, and clickable thumbnails are better than low-res images, I say.
Some screenshots showing the creative use of slopes in 3D space. I have tried to replicate an object from Half-Life, with some variations to make the process simpler. Note: GZDooM does not support translucency in sloped 3D sectors, and so it is not possible to make the liquid in the ionization reactor translucent, nor to have sloped glass on top.
First, the original from Half-Life, then 3 pics from my mod, taken from different angles.
Heh, just some quick n' dirty lensflare insertions. Most of them look fine under ZDoom too (Except the green one has an odd barely-visible box hovering around it, and the yellow one looks crappy as hell.)