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I did add a few more to cover the lack.

Acorn

Xara claims a lineage back to 1981!

Start with any shape you like that is solid with no Line width.
This can be a Box, Ellipse, star or any shape you choose.

Make a clone and reduce by say...

Egg, I always forget using clone and flat fill is a cleaner way to replicate a complex shape's profile. It also saves time converting to editable shapes.

Acorn

P.S. You forgot:

Or

...

Go a step further, create a rectangle the same size, grow it 10%, put behind, centre, soft-group and colour and tweak to what you want.

Or

Put a Glow Shadow on the image, remove the blur and...