I also like that idea, some says it's just the same as Sun and Moon, but i still think it's different, light and dark can be part of elements and can be breed with other elements to make a positive or negative effect, like for example:Originally Posted by peppiegal
Fire + Dark = Hell Dragon
Fire + Light = Torch Dragon
Air + Dark = Tornado Dragon
Air + Light = Breeze Dragon
Earth + Dark = Earthquake Dragon
Earth + Light = Paradise Dragon
Water + Dark = Tsunami Dragon
Water + Light = Fountain Dragon
Lightning + Dark = Typhoon Dragon
Lighting + Light = Electric Dragon
Cold + Dark = Freeze Dragon
Cold + Light = Ice Cream! Lol Chill Dragon
Those are just an example, you can think of any possibility.
I also like the Zodiac Dragon idea to go with the Gemstone Dragon every month. In my other dragon game, they have just release Leo Dragon and Zodiac habitat.