What are the mementos of Crooks?

I would say that one of the mementos of Crooks would be
cleaning supplies.  Crooks' stable and living quarters are quite clean and very tidy. 
It is evident that Crooks takes pride in where he lives, albeit small and removed from
others in that he cleans his living space.  I think that another object to represent
Crooks would be his books, his only real company.  The California Civil Code and
dictionaries would be examples of the types of literature he reads.  At the same time, I
think that it would be essential to have personal pictures or photos of his family,
people that he misses in the life that he leads alone.  In his conversations with
Lennie, we recognize how lonely Crooks is.  He is cut off from the rest of the world
because of race and because of a social condition that does not value bonds between
human beings.  In this, Crooks is alone, so pictures of family members that he knew and
bonds that are important to him, though cannot be lived out now would be one such
example of how a personal emotion can be brought out in an
object.