Hubby going to hear gender before me !! Need ideas for gender reveal with kids !

Danielle • Mommy of 3 girls ages 12, 6 and 4

So I go Thursday for my genetic testing ... they will call me with results but my husband wants to get the phone call and then do something to surprise me... I’m so nervous but excited ! Then I’ll do something fun with a live video with my kids to tell everyone . I have a 2 year old girl and 8 year old girl so any ideas of fun gender reveals for them ? I was thinking of silly string but I need more ideas !