Well, I'll start straight away.
Molly vs. Bellatrix!
Minifigures = Molly Weasley, Ginny Weasley, Bellatrix Lestrange, George Weasley, Death Eater and Kingsley Shacklebolt. Things included: Long thing, Big Hogwarts surrounding etc. Double sided faces: Molly: Happy and Angry Ginny: Angry and Scared Bellatrix: Normal evil face and Frozen (death) George: Angry and Upset Kingsley: Normal and Angry Death Eater: Only one normal face
Set 2: Murder of Snape Minifigures: Harry, Hermione, Ron, Nagini, Snape and Voldemort. Things: Table, surrounding, the thingy with the memory Double sided Faces: Harry: Angry and Happy Hermione: Happy and Shocked Ron: Happy and Shocked Snape: Normal and Tears
I will post another blog with more ideas :)