Wow. I like the last one! It's a nice way to fake a filled vector in few space, sometimes looks like gouraud shading and sometimes like a translucent or depth cube! In fact that's the way some 256b asm intros do 3d polygoned objects which are not really polygons via this way, because it's not really easy to fit a triangle rasterizer in small space. I remember these were blitting smaller boxes and had z-buffer so it wasn't much noticable.