Gender reveal for twins!

C

My SIL found out she’s pregnant with twins and my MIL and I are wanting to do a gender reveal for them. She has 3 girls ages 12,10 and 7. I’m trying to figure out a unique gender reveal for all of them to be involved. I mentioned doing paint but my SIL said she didn’t want to do that 😂 if anyone here has any ideas that would involve 3 girls please let me know