I was thinking they have weapon customizers who can customize a weapon to your characters liking, but they don't allow you to change your weapons appearance.
What if they had an NPC named the blacksmith. You would talk to him and pay him a certain fee say 25000 gold and design your own weapon completely from scratch. Damage would always be max and weapons are automatically customized with damage plus 20% for your character.
The options would basicly include:
Weapon primary color (affects blades, the wooden part of bows, spear tips, heads of a hammer, etc.)
Weapon secondary color (hilts, hafts, bowstrings, other weapon handles)
Weapon trimming- put in unique trimming in the weapon (basicly choose a type of trimming style from a list)
Weapon hilt/other style- choose the design of crucial areas such as hilts, ex. making a double edged sword with a cross hilt or a curved elven style bow.
Ability customization- Buy weapon upgrades from the customizer for your weapon.
Engraving- type in a message, name, etc., to be etched into the blade of a sword, haft of a bow, etc.
Aura toggle on/off- change the color of the glow on your legendary weapon or remove it.
Weapon attribute (only applies to staves/wands/canes/rods/etc.) select the attribute that you want for your weapon if it is a stave, as to not be stuck with the wrong attributed staff, esp mesmer and elementalist.
Choose number of hands a weapon uses- Select whether you want a one or two-handed weapon.
*note- A picture of your character will appear, cape and all, holding the weapon, in order to let you design a graphically pleasing weapon for battle
*note- The weapon will be named after your character, ex Sir Chris's Sword.
*note- You can go back to the weapon maker and change your weapon's style for a cost of 2k each time. To make a new kind of weapon ex. a staff when your current weapon is a sword, you must buy it for the 25k cost. You may have as many of these weapons as you want.