Any ideas for a gender reveal?

Aracelis • Married for.10 years and we have 5 children already. Im pregnant with my 6th child and hoping its a girl since i only have 1 little 9 year olf girl.
My sister is going to do a gender reveal party for me this Saturday and I dont know how to do the reveal. I want a unique one. I dont want her to do the typical balloon popping. Any ideas?