Fires healing power is the element who heals our soul it gives warmth and a safe/ relaxed feeling.
Some us  use fire for meditation or for a good energy in the home, restaurants use
them too to make a good atmosphere. Not for nothing fire as it's own high vibration and works actually like a pyramid crystal, fire takes negativity up in the air and can
take positive energy from it's top, Thanks to the structure of fire.
The best crystal in combination is the carneol and fire agate, this stone gives us the same warm and happy feeling as that fire can give us.
But ofcourse experimenting with different kind of crystals is also a fun and good thing to do.
Here are a few things thath are assiciated with the element fire :

Season : summer
Archangel : Micheal
Directon : south
Original tarot cards : Wands and judgement
crystals : Tiger eye, Amber, Bloodstone, Carneol, Garnet (to name a few)
Chakra : Solar plexus
Herbs : Cinnamon, basil, Sunflower ( to name a few )
All kind of things to make conatc with fire.

Some of us believe that fire has a spirit who you can call upon during a mediation or a ritual, well fire is indeed alive and in my opinion all things around us is alive, trees, plants you name it. So
asking fire for help is worth a try I tried it worked during my meditation I felt a flow of wamth comming to me.But opinions are different about it,depends on what works for you the best I suppose.