UnaidedCoders Star Fox 64 texture pack is an incredibly well made and faithful texturepack. It is easily the best available texture pack for Star Fox 64.
Almost every single texture has been faithfully remade in this texture pack, some textures were avoided due to the crazy nature in which they are dumped. Some textures are made up of thousands of 1px textures which would just be unrealistic to put back together.
If you plan on playing Star Fox 64 again you really must play it with this texture pack as it really helps the game feel more modern.