New Old is a resource pack that adds the newer, cleaner textures from the Texture Update!
Some people like to play older versions because of the PvP, old features, etc., but still prefer the newer textures from later versions of the game.
New Old solves all of this!
It completely removes the old look of the game whilst still maintaining a good performance, making it feel like an new version, but in reality it's old!
This picture is 1.13, the update before the new textures:

Enjoy!
(This texture pack works from 1.6 onwards, apart from the 1.14 version, which won't work in older versions, so I'm putting the 1.13 and below version on this page for now so you can use it in 1.8 PvP)