Light-Highlighted object

Hi everyone, I've been trying to do this for a while but couldn't find a solution.
I'm creating a volleyball game. There is a BoxCollider linked to the player that sets the ball to "Hittable" whenever It enters the collider.
I want the ball to be "highlighted" when It enters the collider, so that the player can visually understand when he can go for the shot/pass, I linked an image hoping to clear it out what I mean.
The problem is that I wasn't able to do this through the Point Light cause it requires the light to hit a surface in order to be seen, but I need it to be shown without hitting a surface.
Is there any solution? Thanks a lot

 

You want a particle or sprite attached to your ball.