For those of you who enjoy the default Minecraft textures but want a little more smoothness and clarity without sacrificing too much performance, Soartex Fanver Modded may be the answer. I've used this texture pack for a couple of years now and I enjoy the smooth and clean looking textures, without it overworking my laptop.
This is the link to the downloads page on the official site where you can choose to download Soartex-Modded directly or through Adf.ly. The "Modded" version is their complete collection of textures. They also offer packs specifically for some of the major mod packs that are popular right now. I would suggest using the "Soartex-Modded" version.
The site also offers a patcher for obtaining newly completed mod textures, and a customizer for adding or creating your own.
This is a short video found on the official site showing a few of the basic textures and animations:
Soartex Fanver Modded is a 64x64 HD resolution texture pack.