I spend a lot of time building in Micro scale (I maintain the Micropolis collaboration standard) and my partner is trying to figure out how to build the most compact, or smallest, six pointed star possible to fit into one of her builds. We've played around with friction set cheese wedges similar to this example but were curious if anyone has any other ideas. We're open to using parts in System, Technic, Clickits, or even Znap or of course any combinations thereof.
Hexagonal symmetry and angles in 15, 30 and 60-degree proportions are scarce among LEGO elements.
I think the smallest single piece that approximates a six-pointed star is the basic flower:
I myself don't practice freelance brick modification, but someone with fewer scruples might easily trim one of these into a 6-pointed star shape.
Another piece that has hexagonal symmetry is the old pulley wheel:
The holes are arranged at 60-degree intervals around the center. Putting two of these pulleys together and inserting half pins into the holes will give you 6 studs arranged at what could be the points of a 6-pointed star:
I added a 1x1 round plate to three of the studs to offset the gear shift handles. This construction is a little shaky, as the half pins will rotate. Not sure if it's compact enough for micro-scale - the star ends up about 2.5x2.5
You could get a 6-pointed star of about the same size using two triangular roadsigns:
These have clips on the back. Putting them face-to-face would give you a clip on the front of the star, and you'd have to find a way to hold it in place, but it would have the advantage of being fairly thin. The color options on these pieces are limited, though.
A smaller six-pointed star which only uses cheese slopes has been achieved in the MOC below: