Magical girl squad huh... [s]And then my brain suddenly jumped to genderbend. Stop, you stupid brain of mine![/s]

Anyway I do have a Madoka Magica-inspired plot idea with reference to the Seven Deadly Sins (the actual sins, not the animanga of the same name). However, it contains a lot of deconstruction from genre to the world...even logic and humanity/morality, so not sure if you're up for something that will stretch common sense and the notion of normality over the edge...

Otherwise, a Lyrical Nanoha-inspired kind would be good, a fusion of fantasy with cyberpunk?