Bring toilet paper in and at the beginning of class pull off "as much as you need." then pass the roll around and ask the students to pull off "as much as they need". after everyone has what they consider to be a sufficient amount of t.p., explain that they need to give one piece of introductory information about themselves for every square of toilet paper that they are now holding. start with yourself.
this is best for smaller groups (it can get a bit tedious with a bunch of people) and for groups who don't already know all about each other.