I call these busy toys and there is one basket of them in the boys room, not in the main play room where all of the other areas are. My definition of a busy toy is: they don't need help from me to use it, there are no small parts and it is easy to clean up. The boys go to their room and play with these when Nate calls me to tell me he is on his way home so that I can have a chance to clean up and start dinner.
P.S. Yes, I arranged the toys in this picture:) Usually they are just piled in there:)