There is a merchant in Andunor, within Greyport, a duergar who sells supplies to change the appearance/color of boots. She also offers to spur them (Add the Ride Skill) and offers minor repairs.
My suggestion is to add other vendors about the various cities that perform similar functions for Belts/Gloves/Jewelry if possible. Being able to customize the appearance of what you have (especially since all the dropped magic items look the same) would be nice, though not a critical add on. Thanks!
Item Appearance Customization Vendors
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Item Appearance Customization Vendors
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Ayiesha Dahyarif
Ilphaeryl Xun'viir