What should I put on my fire place??

So for Christmas I got this new tv stand which I’ve been wanting for a long time

I wanted it because it fills in the space in my living room perfectly. But now once I move the tv I have no idea what to put on the fire place.

The fire place is in a corner of my living room so it goes back towards the wall in a triangle shape. So I have no idea what to put there aside from a picture or two or a candle or something