What was Pablo Picasso's favorite subject matter?

Pablo Picasso subject matter is really non existent what he really wanted to do was to take every day images using an abstracted form and random angles ... there is a Blue Period in Picasso's life from1901 to 1904 where the subject matter was all about blue and the different shads this was when Picasso's friend had died which left him feeling melancholy and with out hope ...