I decided to update this picture into what I think it's the best version, enjoy
The following paragraph contains some spoiler information about the show's season 3:
When I found out that in season 3 of the Clone Wars will have Ahsoka using a new fighting style wielding a second, smaller lightsaber, I wanted to try to make a picture of her with that second lightsaber. Now the way I found out about this was on a special video with the show's director telling secret info about the new season, one of them was of Anakin teaching Ahsoka to dual wield lightsabers, by using a smaller, shorter lightsaber. The way she would fight would be that she uses her normal lightsaber to defend while using the other to make quick stabs at nearby enemies. Now I only saw that video once, so I might have the second lighsaber's design wrong, but I do remember that it made a slightly yellowish green light.
Ahsoka Tano Clone Wars © Lucasfilm Ltd.