How nice to meet someone thinking so alike. Actually I am combining the concept of the seven colours of the emotional spectrum (Green Lanterns) with the concept of energetic dimensions like The Green, The Red, The Blue and even the concept of the Seven Endless (Ds). There are two more heptalogies in the DC universe I am alluding to - but I will not post them here because at least on of my players might get spoiled. @Cassandra: And we are doing time travels, too, this being one of DCs charateristic story telling tools. The power is coming from ZATANNA, but of course only "uncontrolled", that is, only if I prepare a situation where the JL "decides" the only chance is to travel back or forward in time. And they always have to travel to a special magic gate location like Stonehenge, and Indian Cemetary, or a Nazi Bunker to get there. (So for your question this kind of movement might be irrevelant.)