here's another shadow box I made, this one was for my sister for Christmas (she plays guitar and has dreams of becoming a rock star :)).
I put some metallic black cardstock on the background, and stuck silver magic mesh over it. I sprinkled some glitter-like stuff over the magic mesh so that the background would sparkle a little bit, and then pop-dotted a guitar sticker over that. Then I used a white galaxy marker to write on the black background.
she loved the gift and it is now on her wall at school :)