I'll tell you how I made mine, and I love it. I had a regular light bulb base, you'll need one that sets flat, something like you would mount to a wall. Can get it at any hardware store. Then I took a 3lb metal coffee can, and put my light base in there, with a 75 watt bulb. (Make sure your light base is small enough to fit in your can!). Then, I cut a small slit in the plastic lid of the can for the cord to come out of. I cut a double thickness of black construction paper and taped it to the inside of the clear plastic lid. Now I cut a small hole in the center of the lid for the egg. I then took black electrical tape and covered the whole lid and top of can with it, except for the hole. Place egg, turn on light and your good to go.
I candle white eggs, brown eggs and EE eggs. The EEs are the toughest to see, but once you get to day 10 or so you can see them just fine.