Ok, i did it.
To be honest, the only thing that came into my mind thinking of Equilibrium was thermodynamic equilibrium.
And the only thing that came into my mind after that was hot and cold clashing together.
So i made a flame and a piece of ice that meets in the middle, generating energy.
I hope you like it!
I made two versions:
The first has the right color for fire and ice, and a purple
overlay over it.
The Second is totally in purple. Still fire and ice, but they're
colored!
Feel free to use one of them if you like them.