An acute heptagram.  Blue.
Original uploaded by <a href="//commons.wikimedia.org/wiki/User:Fibonacci" title="User:Fibonacci">User:Fibonacci</a>.
2006-05-31
<a href="//commons.wikimedia.org/wiki/File:Acute_heptagram.svg" title="File:Acute heptagram.svg">Acute heptagram.svg</a> Green. (edited)