In good daylight, realistically, it's the size and colour scheme of the aeroplane that makes far more difference to conspicuity than anything else.
You may be right; although in the 1960's era the RAAF painted parts of some of their aircraft such as Dakotas, Hercules and dual Vampires a bright orange for anti collision avoidance. The problem that I recall was you saw the aircraft first and were lucky to spot any colours until too late and by then it was a bit late to take avoiding action. Today, strobes win every time and landing lights can be seen miles away if the aircraft is heading towards you.