Have a baby gender party . Where the doctor puts the results in an envelop and take it to a cake store and have them make the cake pink or blue. Or do the same thing but buy a box of filled balloons that are pink or blue and open it at the party!
I used cupcakes....I found out I was having a girl but instead filled the cupcakes with blue icing :)....I even had a poem that was all about boys until the last line I wrote "and this is why I'm so happy to say...I have a precious baby girl on the way" I was a great way to fool everyone lol....the look on their face was priceless