What do the sisters do to brighten up Beth's room?

From the text,

The pleasantest room in the house was set apart for Beth, and in it was gathered everything that she most loved, flowers, pictures, her piano, the little worktable, and the beloved pussies. Father's best books found their way there, Mother's easy chair, Jo's desk, Amy's finest sketches, and every day Meg brought her babies on a loving pilgrimage, to make sunshine for Aunty Beth.