I was at my house. It was not my current home, but I knew it was my house. I had just bought a new toy and I was playing with it, throughout the whole dream.
What it let me do was change the lighting properties for any object, in any enviroment, or any wall. I remember looking at a can of coke. It was black and white. However, when I set it on a certain table, it became its normal red color.
Some rooms I set to glow with a dark blue aura.. It's a cool dream, but really substanceless. I vaguely know of another dream I had, but alas, I forgot it.