A bubble is something that is beautiful but that does not last very long, so a bubble in a dream can symbolize something that is valuable to you, but that you are afraid will not last.
This can be a relationship with someone, a job or a social position.
A dream about a bubble can be a warning not to be overconfident about something.
Because different colors can reflect off a bubble depending on its source of light, a bubble in a dream can also represent something that is illusory. A dream about a bubble can be a warning that something is not what it seems.
Playing with bubbles in a dream can represent a desire to have fun and to have a break from adult responsibilities.