Orc Male -> Headless Horseman
patch-4.mpq
Here are more races to HH:
Troll Female:
trollfemale.mpq
Troll Male:
trollmale.mpq
Undead Male:
undeadmale.mpq
Broom Mount -> Headless Horseman's Mount
patch-8.mpq
Enjoy ; )
Feel free to leave a request if you want another race to HH also.