BaiaCraftPvP is supposedly a texture pack specifically aimed at giving you an advantage in player versus player situations. Most of the weapons and tools have got a new design and the crosshair which appears when aiming an arrow is also new. Besides that it also got some weird features which doesn't make much of a sense. A good example is the Pac-Man sun.
All of the weapons and tools have new textures.
The crosshair has been redesigned giving you a more clear aim.
The path of the arrow is followed by stars.
This must be the weirdest part of the texture pack. The sun has been turned into Pac-Man!