Harunnobu,
The tray of scotch bonnet I purchased had red pods as well as green, knowing many people around the world eat green chilis I wasn't going to just toss this one and so I tried it and what I found was it had a nice flavour. I now have 6 scotch bonnet peppers plants that I grew from the ripe pods and next year when it comes time to harvest and if it appears the green pods are softening on the plant then I would have no hesitation on picking the green scotch bonnet and eating it.
I had a green bishops cap(it fell of the plant) and it had a taste similar to a green bell pepper but just now, yep right now as I type this, I just ate a mature red bishop and wow, it has a extreme nice flavour with moderate heat. I am still trying to think of what the bishop tastes like but can relay that it tastes nothing like the thin skinned cayenne and nothing like a habanero. Good thing I have 3 more ripened pods to play with. I have tried other green peppers that hadn't ripened to red and they taste nothing like the ripened version, depending on type some were even absent of heat and I would imagine as part of the maturity process, that to red, brings along the flavour aspect, I would say sweetness but can't say for sure if it is a higher sugar content.
As for the psychology of colour versus flavour, I have eated both yellow, purple and red tomatoes and though they have an overall tomato-ie flavour, their was definitely a detection of something different. I have eated purple potatoes but now have to admit I don't remember how they tasted, I am thinking perhaps more starchy but might be confusing it with one of a dozen types of potatoes I have grown in the past. I still remember the flavour of the purple prince tomato and found they lacked the overall flavour of some of my yellow boy lemon tomatoes and some of my other red tomatoes - so I don't have to grow purple tomatoes again because the purple prince just didn't have the flavour that I have enjoyed in other types of tomatoes. (I eat rice approximately every 3rd day and have never tried blue rice but, if I could find blue rice, I would be objective in testing its flavour).