I find that children in school these days are not encouraged enough to write creatively. Since I was teaching English as a second language to my step-kids this Summer, I gave them activities that involved creativity. Some was drawing, some was creating a card like in Magic the Gathering, they could inspire themselves on cards I owned. My step-daughter, after translating 3 cards (learning to use a dictionary) decided to write, in French, but it's still creative writing, a semi-discovery type documentary commentary about the three creatures, inventing the world, inventing their behaviour, inventing everything but their name and what they look like and she, in this way, created a whole new world. So every time we did English activities, her fun was to write creatively afterwards. My step-son has a bit more trouble focusing on a task, but he enjoys reading a lot and that can help develop creativity as well. He's a bit younger too.  My husband and I always encourage that they play games that will enhance their imagination, as in invent a game.  I am a very creative person, so I really enjoy exploring creativity with the kids.