I would either Remove them (If there was literally no way to give EVERY race a Really interesting fluff/aesthetic racial, which ofc seems ridiculous) or just remove any racial which gives a Combat Bonus and change to something Aesthetic.
For example Dwarf - Remove Stoneform and replace with 3 Racials (Each basically the same). Each one just allows you to turn from the standard Dwarf, into either Dark Iron, Wildhammer or Frostborn. 1 Hour Transformation with a 1 Hour CD. Would be perfect for RP'ers, and general appearance change stuff is always cool.