Good storylines anime..........?

Ok I'm having a bit of a block here. I'm currently learning 3D animations and what not to make short movies. I want a story with it, but everything I think of is either crap, uninteresting, or sort a bad rip off from something already made! >.< Ok so I would like some help from you guys, it doesnt have to have so many details, but just a broad idea. Here are some details. I have 3 main characters whom will be made by me (im in planning mode of these characters btw) Their names are Cloud, Rain, and Snow (what? i got inspiration from FF7 and that new FF) (YRP in position!) They are all girls, incase you were wondering(and not all-white because I wanted diversity, Cloud-white american, Rain-Eastern Asian Japanese,Snow will be black american or maybe british with white hair, think Vanessa from Virtual Fighter or Storm from Xmen)...Anywhos this animation will be a fighting one, a 3 girls against the world sort of thing(Hey Charlie's Angels!lol) The time period will be 2009 and later, although Im more into a futuristic theme....Any ideas?Im completely open to them!