More an more project teams are dispersed throughout the globe. All in one room is becoming more and more rare so you will be to be creative.
One fun easy thing you can do is whenever a teammate has a birthday or a baby or other fun event, you can have everyone on the call use the GIF’s to send a present.
I like to announce after all the wise guys post bananas and shoes and gag gifts, and I of gold post a stack of gold bricks, to remember those who “gave the best gifts”.
This works for going away/promotions as well.