There is a section in the hues for UO which have all of the Pre-Alpha hues, the hue currently used for the green armor was a default green and very bright compared to the black counterpart and looked a tad weird.
I replaced the hue in the file to have a hue from the Pre-Alpha section of the hues and it looks much better IMO



Edit: Dropbox decided to make themselves as non user friendly as possible so the files will be attached to the post now.
To install, open the .zip with a program such as WinRAR or 7Zip, then go to your First Dawn install directory (Default Directory is C:\Program Files (x86)\EnigmaUO\First Dawn) and create a folder named backup and back up the existing hues.mul to that folder, then copy over the new hues.mul and if asked overwrite the existing file, I don't know if this conflicts with anyone else's client so make sure to backup your original file first!