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photos, autograph books.

If you notice things are constantly black, but yourself a silver metallic sharpie, they look great on black.

Take a photo you have of the artist/group or a CD cover or a magazine with an article about them. A t-shirt would be good if you could get a pen that would write on black.

a picture might work or somthing special maybe try making your own shirt for them thats not blck?or get a silver mettalic sharpie? But whatever you do dont get them to sign your arm or any body part it is not good for your skin and will come off

get and autograph book

pictures, backpack, shirt, shoes, pillow case, jeans, etc.

get a white pen!