This video shows how to draw a room using one point perspective. This is an entry level introduction. To make it more interesting, try placing your vanishing point somewhere else instead of in the centre.
See another option here: http://www.youtube.com/watch?v=Xv1LFjApbKk
Skitch was used to draw the picture. SnapzPro was used to record the drawing. The video file was then imported into iMovie to add the titles, music and narration.