I got this idea from the MTI show archives. An elementary school (I think) was doing Beauty and the Beast Jr. and did the transformation scene with large flower petals. The petals were a little taller than the kids and made from black netted material framed with some sort of heavy gauge wire. The petals themselves were lined with glitter and decorated with to accentuate the effect. At the appointed time the petals come out swirling, then surrounding the Beast and wah lah! Add some fancy backlighting and or chases and maybe a rip away costume and you've got your effect. Break a leg! I'm struggling with the same scene this week. We're blocking it in a couple of weeks and I need to have it thought out by then.