Just the old Build2001 Skins from Gamebanana. Just to make your Half-life 2 or Build2001 nostalgic. Press "Read more" to see installations instructions.
How to install?
Open the archive and extract "B2001_V1.0_SKINS" into: steam/steamapps/common/Half-Life 2/hl2/custom/.
Half-Life 2 MMod (Buggy):
Ditto but extract into: steam/steamapps/sourcemods/HL2MMod_HL2/custom/.
Open the archive and extract the sub-folders of "B2001_V1.0_SKINS" into: steam/steamapps/sourcemods/Build2001.