For the purposes of this build, we need a pentagon (figure with 5 sides), that is regular (all sides have equal length), and it needs to be able to be mounted on a build (like a wreath) by a technic-friction-pin, (the little black ones).
This may be hard to achieve, with the given possible angles. The pentagonal shape must maintain its shape, no warping, etc. It must also be made of "properly fitting pieces."