[Taqwus]

Metamagic might be interesting; say, a magical item that gives bonuses to dispelling enchantments, or even an artifact which locally causes a substantial drift towards drain, and a twin that's the other way around.
A Standard of the Dead artifact that automatically does low-magnitude reanimation of corpses might be thematic, but perhaps too strong.
A magical eye artifact that lets the wielder ignore Mirror Image and phantasms, and gives him a patrol bonus might be nifty.
Perhaps a commander could benefit from a magical horse, giving him the benefits of being mounted (namely, more speed plus ignoring armor enc for melee purposes).