The base is a piece of black opaque glass. Underneath the glass is a Bowens ProLite 60 monolight at about 1/2 power shooting back against a piece of white foam core about 1 ft. away. Above is a Nikon SB-800 at 1/64 throwing some light on the olives. Two black foam core gobos on the left and right for a little extra black in the glass.
Thanks for the nice words all. I'm loving this lighting stuff.