Free lifetime subscription or at least a seriously reduced lifetime subscription fee for accounts over 20 would be definitively a token of appreciation.
Ingame: a title, ok, maybe with a different color.
A summonable pet bound to an account bound statuette similar like the ethies, but remains in your backpack and could be used also as a normal pet (someone mentioned a Silver Steed, why not...). Eventually the pet type could even be selected from a choice of pets during each summon, but keep the same stats and abilities. Or if you "feed" it a monster in the wild, it accumulates it's stats and skills.
Second house on a normal shard.
Ingame: a title, ok, maybe with a different color.
A summonable pet bound to an account bound statuette similar like the ethies, but remains in your backpack and could be used also as a normal pet (someone mentioned a Silver Steed, why not...). Eventually the pet type could even be selected from a choice of pets during each summon, but keep the same stats and abilities. Or if you "feed" it a monster in the wild, it accumulates it's stats and skills.
Second house on a normal shard.