Hi, just thought I'd give a plug to an ebay supplier, he makes full face neoprene (wetsuit material) face masks in various colours & styles, not just the usual black & white skulls..
I much prefer my open face helmets to my full face 'cause I can hear and see better. But at road speed a bug or stone in the cheek or nose is a real hazard; not to mention sun and wind burn. Did 120kms last weekend wearing one of these masks and it was a great compromise to the full face helmet. Goes right over your face with a hole cut for your glasses and doesn't move around too much, like the 'half face' style.