Apple core cross section
Sweet gum leaves
Seed placement in a pomegranate
Star of David
Christmas tree topper
Star of Fame
Gold star stickers
Star Spangled Banner
Pentagram, hexagram, pentacle, starred
Describing a shape is best done in as few words as possible. Think of the shape as a camera snap shot--you want to capture the gist of what you mean as soon as possible so you can get on with other related (and more important) detail, and the action happening in the scene
A weak example:
Her bright, dangly earrings dragged on her lobes like two gargantuan sweet gum leaves.
What's wrong with this example?
The shape and size is right, but how heavy are sweet gum leaves, or any leaf for that matter?
A strong example:
Her bright, dangly earrings dragged on her lobes like two gargantuan gold-plated starfish.
Why does this work?
Here the shape, size and weight are all right. Plus, using a live creature (or formerly alive) as a comparison only adds to the ridiculous image.