The Festive Collection

There are five dragons in the Festive Collection:

Paradise Dragon    
Carnival Dragon
Tiny Dragon
Steampunk Dragon
Viking Dragon

Carnival Dragon is a Generation EX-II-b Exclusive Metal and Flame hybrid.
It's not breedable at the moment.
Hatching takes 20 hours.

Steampunk Dragon being a Generation II hybrid is the easiest of these to breed. It's pretty straight forward, flame and metal hybrid. Breeding and hatching take 16 hours.

It is easier to get the EX-II dragons by using hybrids as parents.

Paradise Dragon is a Generation EX-II Nature and Flame hybrid.
Breeding and hatching time are 20 hours.
Both parents need to be at level 10 or higher.

Tiny Dragon is a Generation EX-II-b Nature and Light hybrid.
Breeding takes 12 hours and hatching 16.
Both parents need to be at level 15 or higher.

Viking Dragonis a Generation EX-II-b Ice and Sea dragon.
The breeding and hatching both take 20 hours.
Both parents need to be at level 19 or higher.