Sword Skins.

My celestial sword will change skins every once in a while to this.

http://img516.imageshack.us/my.php?image=gw017yc1.jpg

What sword skin is that? And why is my sword doing that?

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yeh, we can't see it but i am 99% sure that you mean that it changes to the weaponspell-skin. In case im right: this is just because a party member casts a weapon spell on you, it will end when the weapon spell ends

Weapon spells change your weapon's look.

I think you are right...

@High Voltage Killer: check this link: http://guildwars.wikia.com/wiki/Weapon_spell

Does your Sword look like that?

Oh, yeah. Thanks guys. Is there any weapons that actually have those skins?

The Sword looks a little like the Tormented Sword
http://images.wikia.com/gw/images/f/...nted_Sword.jpg

The Axe too:
http://images.wikia.com/gw/images/2/...mented_Axe.jpg