These are the sword designs I use in my Simpsons Fantasy related fan art images.
The Ice Brand isn't wielded by anybody in art work, but if Simpsons Fantasy was a released game, it would've been one of Maggie's equipable swords with an Icestrike ability, it was taken from an episode of Futurama.
The Flametongue is wielded by Sideshow Bob in Simpsons Fantasy IV's artwork as well as equipable by Maggie in the original game with the Flamestrike ability. It was originally used by The Shadow Knight in Marge Gamer, but Moe called it the Flame Sword, a name I do not like.
The Maggie Blade is Maggie's primary sword she uses in nearly all of the previous pics I've drawn, it's an entirely original sword from Nikki Wright
And The Sisterhood is Lisa's sword used in Simpsons Fantasy IV images, and it is also used by Maggie in her Valor Form, it was modelled after Tidus's Brotherhood in Final Fantasy X.
For more information and read the fics check out [link]