I would like to see dye available for a lot of cosmetic items. Tattoo dye would be great for allowing them to match our outfits or provide better contrast for varying skin colors.
I would also like to see hair dye become a thing, with the full palette of clothing dye colors available. Surely if magic is strong enough in this world to teleport and throw fireballs, then a person could make their hair blue if they wanted too.
Cosmetic items like earrings and forehead jewelry would also be nice for getting a good match to our outfits, with the ability to dye the metal parts and the gemstones separately.
A final thing that would be really nice is dye for the accessories on our mounts. Not just he saddle, but also the armor, straps, and saddle bags that we get from mount upgrades.