Surprising my partner with the gender... idea?!?!

So we still have a few weeks to go until we find out if it's a boy or girl but I really want to suprise my partner with the gender!! He will be there for the scan but we agreed only I will find out there and then... so please does anybody have any idea how I can tell him?? I want to do something special since he missed the whole pregnancy and birth of our first! It will be just for him and not a reveal for lots of people 😊 all ideas welcome and appreciated... thank you!!!