mdi icons for indicators?

[philpownall]

Is your feature request related to a problem? Please describe.
I am using your lovely card to display the azimuth of the major planets, I would like to be able to further customize the indicator used. The icon of the entity being displayed does appear on the top-right corner of the card, but not as the indicator.

Describe the solution you'd like
To be able to (for example) to use the Home Assistant icon of the entity as the indicator.

Describe alternatives you've considered
I presently use the color of the indicator to represent the planet (red for Mars, etc).

Additional context
It would be great to also increase the size of the card, and display all of the planets on the same card...