I finally had some time today to sit down and make some exterior lights for my Korber background building. It's supposed to be an apartment building, but I'm turning it into a business named after my grandfather. I used parts from Plastruct (www.plastruct.com) and nano LEDs from Evan Designs (www.modeltrainsoftware.com). Her are the specific parts from Plastruct:
LF-6 - 7/16" light shade
AB-6 - 3/16" clear acrylic ball
TB-4 - tubing (TB-3 would also work and might even look better. TB-4 is what I had on hand)
I cut pieces of tubing about 5/16" long and then put 45 degree mitre on one end. That was then glued to the lamp shade. I cut a longer piece of tubing and put a mitre on one end of that was well.
I took an LED and fed the wires up through the shade and tubing. Since I used the 9v LEDs with a resistor, I had to cut that off first (and reconnect it later). The LED needs to be pushed into the shade as far as possible.
Then I took one of the clear acrylic balls and glued it right on top of the LED using Testor's Clear Window Cement. It's hard to get the ball exactly centered, but as long as it's close it'll look ok.
Then take the wire and feed them through the second, longer piece of tubing and glue them together. After the glue had set, I covered the ball and underside of the shade and applied paint.
Using a 9/64" drill bit, I placed holes in the building where the lights were to be placed. I used scrap pieces of MDF as support on the back side. A little glue held the lights in place.
I finished off the wiring and put this project to bed!
Thank you! 
