He Uses Sphax Pure BD Craft, U Can get It In 16x16 All The Way Up-To 512x512
Yogscast_painterly
dokucraft
You download a texture pack, drag it into your texture pack folder, and then select it through Minecraft.
They use Dokucraft and you can download that on the Minecraft Forums
You can if you use mods or server texturepacks
Simply download the texture pack and place the zip file in the texturepacks folder in the .minecraft directory
When you downloaded the texture pack, it should be in a zip file. You have to put the .zip file into the %appdata%>.minecraft>texture packs if you are a mac user: Your Mac id>Library>application support>minecraft>texture packs. Do not use the Library in the macintosh HD Drive. Then you open up minecraft, then you go into texture packs and mods. Then choose the texture pack, then say ok, then play minecraft :)
Use MCPatcher
Goatsee craft
He Uses Shpax PureBDCraft
yeh , its the same thing, just put it in your texture pack folder,if you dont know how to find it, its here:'your username'/appdata/.minecraft/texturepacks
Use the texture pack generator from Painterly. Link in the related links section.