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Balloon backdrop!! No tutorial, but I would try to duplicate this by having a 2x4 as long as the desired backdrop width and place it on the floor. I would tie each string to the 2x4: the shortest strings on the darkest balloons and make the strings vary in height, with the lightest colored being the longest strings.
Cute idea for backdrop at a children's party. Or switch the colors for a high school or college graduation party, baby or wedding shower. Could have a lot of fun. Secure balloons together with ribbon and make sure you create a circular effect with them.