Vanity reward suggestions that will make doing achievements and small events more fun. Feel free to add to the list.
Transformation Potions: potions that when consumed, will transform a player's character sprite into that of a monster (either random or specific to the potion). Players must stay in peace mode and will not be granted any attacks of the monster. If the player changes to battle mode, the sprite returns to the original character model.
Instant Taming Rod: instantly tames any monster with 1 click (up and including boss monsters of higher level). The monster cannot change maps with the player (so a db tamed in WG can't be brought into town)
NPC summon potion: summons a (potion shop, bow shop, alchemist, or bank) NPC at the player's location. The NPC will only last 5 minutes before disappearing. Cannot be used by players in war or in dungeons. Also the NPCs will have limited stock of items (either only low level potions, etc or like 10 full HP potions).
Bag of Oats: when mounted on a horse/bull/phantom, it will increase your running speed by 50 until you take off the saddle, get damaged, or change to battle/pk mode. Cannot be used in war.