This is the beamerposter theme I hacked together for my poster presentation – enjoy!
Possible paper sizes: a0, a0b, a1, a2, a3, a4.
Possible orientations: portrait, landscape
Font sizes can be changed using the scale option.
Three colour themes available (you create your own!)
An event poster with a simple layout, courtesy of beamer. Try scanning the QR codes with a scanner app (e.g. "Scan" on iOS; "QR Droid" on Android and see what happens!