Here is where a little judgement will have to come into play. I regularly see flashy bonsai pots sell that I wonder what people are ever going to do with? Pots that look like coiled dragons, etc. You never see them again - certainly never at an exhibition. I think many people buy pots because they just enjoy the pot... without it being seriously considered as a bonsai pot. Or else that they are just starting in bonsai and don't really understand the concept of pairing the pot with the tree. It's similar to buying an Old World master oil painting and putting it in a modern stainless steel frame that has cats and kittens stamped on it. Some people might love cats and kittens - and the frame as a piece of art might be interesting, but its use in this context is the art equivalent of fingernails on a chalkboard. So I tend to see colorful pots either used by beginners who use them incorrectly, or by advanced enthusiasts who know how to use them correctly - and who buy expensive pots. But regardless, my comment about using them much less frequently still stands. You might have 20 muted pots for every colorful one, unless you only keep shohin. To be honest, I'm not sure I have any colorful shohin pots, because I don't have any shohin - or at least none that I would put in a colorful pot
On Peter Krebs' site, he has some photos of amazing antique painted pots.
Museum Pots 1
Museum Pots 2
My comment about "frost-proof" was inexact. I should have said "robust for outdoor use, including below-freezing temperatures".
Also, though I mentioned tie-down holes in my list of functional items, they are really a Western invention. I'm not sure of any Japanese potters who use them. You can see, for example, in the Tokoname video, they only use drain holes. In my opinion tie-down holes are a "nice to have" and not a hard requirement. I don't have many pots with tie-down holes - I just wire my tree into the pot through the drain holes. I certainly would not want tie-down holes if they impacted the strength of the pot, or had any other negative effect.