Its possible, unless when Shaak Ti fought the MagnaGuards in Clone Wars (the original cartoon, not the new one) was deemed uncanon. She held 2 of those MagnaGuard Stick things (I don't know the official name
Anyways, I have a list...
Dual Curved Sabers (ala Komari Vosa (or whatever her name was) and Asaaj Ventress), both with shades of either red or blue
Regular and shoto(short) saber, Green and Purple, respectively.
Dual Regular Sabers, both blue
Double Dual Phase Lightsaber (I think I just made that up. Its like a Super Double Lightsaber, but you have the chance to cut your body in half every time
I'm unusual, aren't I?