Brother Adso of Melk and Brother Jorge of Burgos.
I suppose there's a different between loud and "garish" - we don't want to go down that road. I have a few that would be considered "garish", but then again some others might consider a tie to be loud where I don't.
For example, my "ducky tie" - the red one with the seagulls which actually got a good few thumbs - would certainly be loud, but for this I'm not sure I'd use it. I have some strong pink and yellow ones, but again they would edge toward garishness.
I'll have to look through my ties and see what I have!
I think there are two ways to do this - and they are both about context. One is the loud / quiet combination - using a very sober background for the tie, and the other is the approach which makes the tie part of a complete and coherent loud fit. The former is easier (especially for those with an 'SF approved' wardrobe) but requires the tie to be of an undeniably superior quality - because it will be highlighted.
Consider these two examples (from me in 2012 - not suggesting they are the best around, I just have the pics and they were part of a series of experiments I did on exactly the question of loud ties):
Same suit, but in the first instance, the tie is amazing loud but the design is coherent and the tie itself is of a high quality, and in the second it's badly-designed, cheap and loud.
Anything inbetween is going to have problems (IMHO)...