I have also done the super soaker and gasoline one, works pretty good and looks really cool. I however do not advocate the use of childrens toys to create a potentially dangerous home-made flamethrower, unless you want to light bonfires the fun way! You also have to run water through it after each time or the o-rings will be shot in a couple hours. Also invest in a good supersoaker, the farther it shoots the more fun it is.
Here is a cheapo with melted o-rings
