A simple hand made banner with few balloons around
Fast and simple decoration with store bought Bday banner at the center and simply stick balloons on both sides
Flower balloon deco a simple one, make some flower balloons and stick them to wall like an arch.
Tutorial - http://www.youtube.com/watch?v=UV773CpPdfk
Balloon Flowers on other sides of the walls.
Balloon Flower arch and side stands