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No I havent, but if you insist on going ahead with it I suggest buying a plasma ball kit and somehow fitting it to the monolith. A quick search online reveals there are miniature plasma ball kits. The smallest I found was 4" diameter, there may be a problem fitting something this large into the monolith.
I assume you're using it to replace that fake-looking green crystal. My main concerns are the power source (probably need 12V or more) and the structure of the model. To fit a plasma ball and it's power source you'll need to remove quite a bit of the internal structure holding the model together and perhaps may even need to cut a large hole where the crystal normally sits.
If you manage to find a plasma ball less than 3" and powered by a 9V cell, go ahead with it but otherwise I think it's a little too much trouble.
And over there we have the labyrinth guards.
One always lies, one always tells the truth, and one stabs people who ask tricky questions.