Whether traffic is called by ATC, reported by FLARM, TCAS, PCAS or even a pax - YOU still have to visually aqcuire it to be able to avoid it. Lots of posters in this thread commenting on white paint schemes, quite rightly in my view.
I don't know if Grob or other manufactureres have tried to follow suit for thier 'plastic fanstastics' but take a look at
Photos: Cirrus SR-22 Aircraft Pictures | Airliners.net
Cirrus probably didn't work out how to put colour on their aircraft as one of their safety innovations, but I know I'd rather fly /be looking out for a coloured one rather than a white one.
The colour paint is relatively new technology for the Cirrus. From an 'avoiding mid-airs' I would like to see it used as widely and often as possible, especially considering how much 'Got To Be White' that we are collectively capable of putting in the sky on a nice day (powered and non-powered).