What happens next?

How to make your cat's basket a castle
Keep your cat away from its basket.
Give it a place to roam about for an hour or two, so that it will not get bored and interfere with your decorating.
Cat proof the area that your cat will be in, to make sure it does not ruin anything.

Possible answers: A. Empty out any loose dirt that your cat may have brought it from outside. Go outside with a dustpan and brush, and brush the bottom of the basket with it to get any mud off. B. Place cat proof boxes, in clusters along the walls, at opposite ends of the room so that your cat won't inspect them. Make sure the animals cannot easily escape from their areas. C. Test the basket's placement so your cat cannot simply hop into it. Place your cat's basket in a location where it knows it will have privacy, where it does not invade your home's decor and gets with the flow of the environment. D. This can be done while it is in the basket, or gently by placing a cushion or rug over the area. This will keep your cat from excessively venturing outside.
A.