Balloons are still in base game. You can search by the word itself and two wall decorations and a toddler baloon-theme lamp will appear.
Also some people can get really creative with available stuff. So if I want something fancy but my imagination/building talent are lacking I scroll through gallery. Just select rooms and search for "birthday" and there are tones of cute rooms/deco there. Actually I did it right now and there are some really cute ideas/paintings.
But most of the time I just make a cake as well )))
