For the Tai Lue people of Laos, a dreamcatcher protects the sleeping person from negative dreams and allows only positive dreams to pass through. On the other side of the Pacific though, the Huichol people of Mexico call the Tai Lue dreamcatcher “Gods’s eye” (Ojo de Dios). For them, it represents the spiritual eye that has the power to see and understand things unreachable by the physical eye.
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However, regardless of their origin, name, or local beliefs, I think that the dreamcatchers speak directly to our soul, through the universal languages of geometry and colors.  They speak in an uplifting, relaxing, and somehow meditating and healing way, helping dark thoughts to fade out so as to make room for more colorful ones to fade in.