As they lean over the beans in their rented back room that is full of beads and receipts and doll and cloths, tobacco crumbs, vases and fringes. (line 11)
Sure, old people aren't the only packrats in the world – but it does seem that grandma's house has waaaay more stuff in it than other people's, doesn't it? All of these things are testaments to what's gone on in their life. And because other people seem to have moved on, these things are all that are left as mementos of important times.