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At MAS we've had good luck with an artificial star made from a single strand of optic fibre poking though a hole in a plastic jiffy box - and lit by a variable LED at the end of the strand. When you stick the strand out of the hole just seal it up on the inside with black (automotive) silicone and when it's set just snap it off clean. Just buy a cheap optic fibre lamp off eBay for about a buck and get a few hundred strands.... just make sure they're glass!
At a distance of about 25 meters, at night, it looked for all intents and purposes like a star. It made collimation a breeze.
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