I need some bedroom decorating tips and ideas! Details inside?

My younger sister (18) is now living with me, she has Schizophrenia and I can take better care of her. Anyways she asked me if she can decorate her bedroom (she has been in hospitals and institutions most of her life) I said of course problem is we have no idea. The walls are a light gray color she picked out.

Her favorite colors are Gray, black, red, purple, sliver. Red and black being her favorite.
She also loves Anime (NAruto, pokemon, yugioh, vampire knight) And music. Mostly rock. However Demi Lovato is her hero.
She needs bedding her bed is Full size and black. Im at a loss any help would be great thanx!
 
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