This is going to sound like a cop-out but I swear it's true--it depends on the toilet and door chime! Door chimes are basically bells or tones, so it's a little easier to identify, which also makes the color clearer. Usually for me, higher notes are lighter colors, and door chimes are usually higher notes. Bells in general are blueish (ymmv though, different people see different colors). Toilets are affected by the shape of the bowl, although most I've heard are somewhere between E flat and F.

Also dude very gentle hi 5, fibro is the pits. :(