1. Chariot of Conquest. Inspired by the Tarot Card. Two creatures with 7 or more hit dice each must be hitched to the chariot for it to be activated. Provides everything the inspiring conquerer could want, including an anti-magic shell, a beverage cooler, and the ability to summon elementals.
2. Monk's Jacket. This probably resembles the sort of "gi" that monks use. It grants all sort of useful abilities such as unarmed attack, slippery mind and perfect body, extraordinary feats of athleticism and even flight, and perhaps a few simple low-level spells such as Flare and Daze Monster. Can summon monks weapons with the appropriate enchantments to get past common damage resistances.
3. Hat of Conjuration. To the uninitiated, this simply is a device that can summon monsters. But the person who knows how to unlock its abilities can use it to cast spells, animate objects, send people or creatures to another dimension, enhance his own attributes, and all kinds of other things that magic hats can do.