I'm a game artist by trade, and a fairly seasoned gamejammer. The thing I was most proud of in this jam though was the shader I wrote (in UE4, it's all node based) to simulate a CRT monitor in game.
It looks a lot nicer in game with the scanlines. To create the effect I actually split all 3 channels and masked them through a a fake CRT style RGB pixel set up. It added a lot to our images in game and gave them an older school feel. There was a lot of other 3D stuff we had included as well, but it's not particularly wild. I actually avoided as many textures as I could in order to focus on other things. The only textures I included were 2 normal maps used to break up the floors in places.
I have a fair amount of 3D experience, if anyone has any questions or wants any tips on 3D work (specifically the sort of stufff I do for jams) then feel free to message me!