Here's a few plot ideas I've been kicking around. Since I can't do anything with them for the immeadiate future, you can use them if you want.
1) A girl from a family of superspeedsters tried to help her father against a supervillain. The villain uses a device to turn off her equivelent for the Speed Force as she approaches lightspeed, and the girl is turned into a mile-wide puddle. Due to the nature of her death, the Speed Force expy is keeping her spirit from going to the afterlife. Now a ghost, the girl runs across the the earth at insane speeds and unable to stop, now threatening to destroy the world. Her father teams up with a paranormal detective in order to bring her to rest and save the world.
2) A goth hears his father's dying wish to hug everyone in the world while wearing a bear suit. (He was rip-roaring drunk.) But a wish is a wish, so the son dons a bear suit and tries to at least hug everyone in the tri-state area. Hilarity ensues, courtesy of his attempts to hug, among other things, a child under quarantine and everyone in a top-secret military base.
3) This is significantly less developed then the others, but I still think it's a cool idea for a fanfiction. You know how in crossovers you'll have two heroes meet, fight, then join forces against a common foe? I think it'd be cool if it was done in reverse, with two groups teaming up to accomplish something, then their alliance falls apart at the climax, and they fight each other and their original enemy at once. I think it'd work best with anti heroes, but a big challenge would be to make sure the buildup to the fracture doesn't come across as contrived. (I'm picturing it in my head as a Firefly/Cowboy Bebop crossover.)