Thematically, various cuts of elf would probably be good for bonuses to Perception, bonuses to stay awake (I imagine elf-blood tincture would probably be like an energy drink for creatures that normally sleep), and bonuses to against charming or mind magic. Elfbone arrows would probably be strong against undead (a call back to elven immunity to ghoul paralysis).
Orc would probably give bonuses to Con or various endurance traits, or maybe minor versions of barbarian rage. Orcs have been more recently encoded as having a primal/druidy bent, so maybe some minor effects mimicking lower level druid or ranger spells.