Once upon a time, there was a little house mouse. At Christmas, the house was filled with delicious smells. The mouse peeked out from its hole. It saw a big Christmas tree with shiny ornaments. The mouse was very curious. It wanted to explore. But it was also afraid of the humans in the house. So, it waited until everyone was asleep. Then it scurried to the tree. It found some crumbs under the tree that had fallen from the Christmas cookies. It ate them happily and then went back to its hole, feeling very lucky on this Christmas night.
In the 'a new house for mouse story', it may center around a mouse family that has outgrown their current dwelling. The mouse decides to look for a new house. It could be a story full of imagination, where the mouse imagines all kinds of wonderful houses it could have. Then it starts the search, looking in the fields, under the bushes, and even near human houses. Eventually, it discovers a place that meets all its needs and becomes its new home.
Once upon a time, there was a little mouse in a house. The mouse was very curious. It scurried around looking for food. It found some crumbs in the kitchen. But there were also some cats in the house. The mouse had to be very careful not to be caught. It made a little nest in a corner of the attic. And that was its little home in the big house.
In a house mouse Christmas story, the mouse might steal some Christmas treats like gingerbread cookies. For example, it could wait until the family is out shopping for more presents and then dash to the kitchen counter where the cookies are cooling. Another thing that could happen is that the mouse could get tangled in the Christmas lights while trying to explore the tree. Maybe it would then be discovered by a kind - hearted child who would set it free and even leave out some extra food for it as a Christmas gift.
The primary character is the mouse. But depending on the story, there could be a human character as well. Maybe the mouse is trying to build its new house near a human house, and the human unknowingly affects the mouse's plans. Or perhaps there's a friendly human who helps the mouse in some way, like leaving out some scraps of material that the mouse can use for its new house.
One interesting concept could be crossovers with different Disney universes. For example, having characters from 'Frozen' interact with the regular House of Mouse crew. It creates new and unexpected storylines.