A.B.
A friend of mine dressed up a teddy bear in a onesie & had it sitting on their bed when her husband came home from work. She put a bottle and binky in the hands and put a bib on that said, "I love you Daddy". A little cheesy, but he really enjoyed it (and the things came into use later). The best thing of all is that he's a Harley Davidson rider & the onesie and bib were tie-dyed Harley clothing.
To tell their children, they waited for awhile & then had a big cookie decorated with "Congrats" and put the ultrasound photos all over balloons when they came home from school. It was a celebration.