In DragonVale for the iPhone and iPad, the Panlong Dragon is a nice looking dragon that is available for a limited time.
The Panlong can be bred by mixing dragons with air, earth, fire, and water elements. For this reason, mixing the Blazing and Mud dragons is a good idea, as well as mixing the Fog and Lava dragons, since combining these gets you all of the elements at once.
Check out my DragonVale Breeding Guide for more dragon breeding combinations.