Chroma Key

We have been using chroma key or green screen techniques extensively and we have experimented with cloths, painted walls, coloured screens... a plethora of options. 

But what we would recommend is a new technique that uses an led ring which is attached to the camera and a special screen (chromatte) which has millions of glass beads imbedded into the fabric. The fabric picks up the light from the leds and feeds it back to the camera lens on the same path creating a smooth and even chroma backdrop. 

Highly recommended, made by Reflecmedia.