This simple script will add Diablo 3 style health orbs.
When player moves over them, it will heal all players and controlled pets within 4 tiles radius, for 20 (+enhance bonus potions) percent of their maximum hit points or remove poison when target is poisoned.
Just drop it somewhere to Scripts folder.
To trigger it, add line
in PlayerMobile or BaseCreature or specific monster script to OnDamage(...), OnBeforeDeath() etc.