It's been quite a few years since I last mapped for UT (I am more familiar with mapping for Doom/Zdoom). I have been through the basic tutorials again and I can make my basic geometry, water/lava zones and add actors, so I have the very basics of level building.
Something which I would like to know how to do is add things like 'trims' or decoration to my walls and floors. For example a trim of a new texture around the edges of floors or perhaps girders built into the sides of walls. Things that will help make the level look more visually pleasing and break up the boring flat textures.
For example, in this screenshot below, you can see the mapper has added a grey trim on the floor to show more clearly where the sides of the ledges are:

Perhaps if the answer is more complicated someone could take the time to post a link to a tutorial?
I apologise if this is not clear enough, if so I will try and explain what I mean a bit further.
Kind regards
K