They're implemented using the stencil buffer because clipping made my head hurt. Hopefully this does the trick!
There are also floor decals, but I didn't think to show those off.
You can also see the implant bar in the top right, with my (awful) placeholder implant art in there. SHilbert has promised to help me work on UI consistency. This is a good idea because I rikey rikey the full-intensity RGB colours, and I'm told that isn't what artists actually do.