Some images below from my Augmented Reality in Unity3d talk at dotBrighton, where I instructed users on how to make Augmented Reality demos using Unity3D, Vuforia, and gyroscope, and how to get them running on their iOS and Android devices. By the end of the evening, I had ~20 people with AR demos running on their devices. Result!

AR using Vuforia

Desktop zombie AR.

Marker-less AR using Gyroscope and Camera.