Situation

Very simple. A user is moving a mouse over a web page. Every element the mouse moves over receives a highlight as the mouse touches it, and the highlight is not there when the mouse is not touching it.

Requirement

Let's be as efficient as possible. As visually attention grabbing as possible, without being jarring. And hopefully as aesthetically pleasing as possible.

I thought about some options, but unless people demand I won't bore you with those. I'm not a UX guy but kind of wish I was since I am interested in how to make this UX the best, most helpful possible.