At our office when a colleague or their wife was having a baby, there was a big plant (a palm-type thing) that would get put by their desk.
Once it was known they'd gone into hospital blue and pink ribbons would be tied to the top. Any known updates would be printed off and attached, until one set of ribbons came off and the baby's details were listed
It was fun and saved all those nearby from the endless 'any news yet'