I found a fiery dragon sword in Sorrow's Furnace and it was blue, not the normal orange. It just randomly dropped off of a boss and the name of the weapon and the stats and stuff look the same as a regular FDS, but the flame is just blue. Here is one of the screenshots I took in my glorious 15k Rock Armor on my Ele.
For you disbelievers I made a very short video in Guild Wars to show that it's not just a few photoshopped screenshots: http://www.foxdedicated.com/bluefds.avi
It's only 782kb, so anyone can download it really, and it's encoded in XviD.
If you guys want to see it I'll be online later, just post your IGN and I'll contact the people first come first serve (after I show it off in RA and show it to my friends/guild members, so it might not be until tomorrow.) If I skip you because you're offline, I'll get back to you tomorrow or something, whenever I can see you on and I'm not busy in GvG.
D

It could most possibly be one of the 'rare' skin weapons, such as dual dragon headed Jeweled Staves and the Scepter of Orr-like earth staves.
