Has anyone done a special "gender reveal" specifically geared towards the siblings-to-be? The older of my two daughters is nearly four, and I think she'd really "get" it (we'd love to film her reaction to finding out whether she's getting a brother or a sister)....the younger doesn't really understand boys/girls, but will surely get caught up in the excitement as well.
I've seen people wrap boy/girl outfits, tint the icing inside a cake (we tried to do this for DD2, but the bakery messed up!), open a box of pink/blue balloons.....but I'd love to do something special just for the girls. I figure you all are so creative there are bound to be some great ideas floating around!