Child is given three boxes to clean their room: one to keep, one to give away & one for trash. Children’s hardcover book, possibly from the 1970’s.
As the child sorts through their room, instead of sorting into the give away or trash, their imagination takes over with each item, with detailed illustrations, and they convince themselves they must keep everything.
I’m looking for this same exact book! I can’t figure it out, but I know the character was a girl and I’m picturing her room having yellow walls (I could be wrong, it’s been over 20 years since I read it last)!