Guild Wars 2

I saw a lot of weapons have the same skin even if they have different rank: blue, green, yellow. It would be nice if weapons will have some color to it to make it distinguishable.
Also, during night they can glow in different colors

Weapons don’t dye, won’t dye. The transmute stones are there for that reason, they were created the way they were. You will just have to keep going till you find a skin you liek and transmute it. As for the glowing weapons, look at the dungeon rewards from ascalon catacombs, it is their unique feature and won’t be put on other weapons.