In birthday decor mainly balloons and cutout of cartoons are used because children likes all these things. You can see how these things are used in the birthday decoration.
The different types of air jumper is also there to entertain the children.
This is my entry for today's #colorchallenge Green. This #colorchallenge is initiated by 
#colorchallenge Thrusday Green : Birthday Decor in Garden
different angle view of birthday decoration