Hi There. First thing that can to mind is crystals. High quality lead glass crystals would look cool. Do you have a newish sunlight like light?
You don't want them hitting the light but you could hang them to reflect the light and cause rainbows everywhere.
Second is a small mirror ball that spins. Like a dance floor. Lots of sparkly and moving light won't hurt the plants and will go off when the light does.
I've read in a greenhouse growing book, That the light that's sparkly and moving confuses the bugs, and they don't like it and leave. It's what the book said.
Good luck.
Chuck.