Bring in odd-looking props and have your students choose a prop that they will build a speech around. Students often wonder what to write their speeches about and providing props provides a tangible means of getting them started in the right direction. You also can use funny props, such as a clown nose, to break the ice.
Have your students share embarrassing public moments. Students often fear that they will become flustered while making a speech. Remind them that everyone goes through awkward moments.
Take your students on field trips to hear experienced speakers giving presentations.
Assign your students a speech in which they must dress as a certain character and present a speech from that person's viewpoint.