My first attempt at solving Bruce's "challenge". It's impossible to do with cheese slopes, but cheese graters are, according to Bricklink, 18° -- half the proper angle of a five-pointed star's point. That's perfect! I even have a bunch of those!
In theory, this mosaic isn't gappy. Don't you just love how perfectly Lego works, hypothetically?
The problem is, cheese graters are actually more than 18°, so this doesn't work. Though it kills the star, I'm sort of digging this kind of gappiness -- reminds me of one of my favorite mosaics.
Also, why has my build output slowed to an occasional crawl? Because COLLEGE. This star, among other things I won't show you yet, was made while listening to an online lecture. Just so you guys know what I'm up to.