The most effective method of breeding a snow dragon is Cold (lv 10 left) and Blazing (lv 10 right). It has about a 41% success rate. The egg is light blue with light blue swirls. It takes 8 hours to breed, and 8 more hours to hatch.
Other methods include:
You may also buy the snow dragon from the market for 1,000 gems.
Snow+Fog Snow+Storm
You can't breed these, you need to buy them with your coins.
You have to buy it. It is one of the main base dragon.
You don't breed a Kairos Dragon in DragonVale. You have to get parts to complete it.
I'm pretty sure you breed an air with a cold, but I'm not positive
you breed a ice dragon with a mine dragon
You have to breed a plant and a fire dragon.
As of July 2012, there has not been a star dragon in DragonVale.
You have to breed a metal and a water dragon together.
You have to breed a sun and moon dragon together
You have to breed a plasma dragon with a salamander dragon.
There is no "marsh" dragon in dragonvale but if you are referring to the moss dragon the best way to get it is earth and plant, although you also have a chance to breed the tree dragon.