Sphax PureBDCraft for FTB Ultimate
Sphax PureBDCraft is the number one used HD texturepack for minecraft. I saw that in a study one time that Sphax84 re-posted. I swear it was legit. Or at least a clever fake. Anyways, Sphax is a beautiful texturepack that has a unique comicy style (apparent BD is a french thing for comics).
This guide will show you how to install the texturepack and get sphaxified 0.O