I love this birdcage idea! Go wireless and use a string of LED lights to illuminate your newly repurposed vintage birdcage. You can use rubber bands or clips to create the shape you desire for the light sculpture inside the birdcage.
If I were a bird enthusiast, this would be an awesome bird cage chandelier. I was thinking more along the lines of a hanging upsidedown bird cage (w/no birds, of course) with a few added lights & some dangling crystals & whoolah!