I view the graduation thesis as a very special milestone for the life of a student. After answering exams' questions written by others for five years, the thesis is the occasion where you will define your own question and answer it in a dissertation.
Here you will find some of the questions I am trying to answer; if those resonate with you and you want to make them yours, let us discuss about them. If instead you feel that you'd like to address some other question around which you have some vague idea let us discuss about it too and see whether we can make it more concrete.
Always bear in mind that the choice must be made actively by you; do not expect to be passively "assigned" a thesis on a "whatever comes around" basis.