We had Peter show up with a number of small projects he has worked on. One being a magnetic field visualiser: tesladownunder.com/Magnetohydrodynamics.htm#Magnetic%20sensor%20array
As well as a plastic sheet that shows off magnetic fields.
Jonty showed off some of his Blender designs that he was ray-tracing. There are a few of us who are working on building a photobooth demo project that's based on a Raspberry Pi. Stephen and Phillip are busy writing software for it and I have thrown some hardware together. Press a button and the rig will light up a LED ring, take a photo and upload it to twitter.
Ross repaired a 12 year old laptop and Diane was cutting out embroidery stencils.