It's the bloom that's in the Post Processing Stack. It has an official release now, you can download it on the Asset Store for free. It's by Unity themselves. It's great for a lot of stuff besides the bloom. Hopefully they include it in future Unity builds so you don't have to download it and more people know about it.
Oh ok, I was looking at that earlier. I decided to spend the money and buy Sonic Ether's bloom. It works really well! Thanks for the help anyways.
His bloom is really good and I think better looking and more controllable than the post processing stack one. It's probably the best thing I've bought on the Asset Store. Main reason I've been trying to move to using the stock stuff is just to reduce dependencies on third parties.