FWIW I noticed a single yellow $20 and a blue $10 in the tray in a $1-2 NL game at the Borgata. Just to convince the table I was a bit eccentric (Caroesquely, I suppose), and because I enjoy being a nerd about such things, I bought them and put them into play. I was sorta surprised that the dealers (Lourdes, Julissa, and Chandra IIRC) didn't color them out, but they indulged my silliness.
But then my conscience kept reminding me of the recent "hidden high-denom chip trick" thread, and I thought someone else might accuse me of shooting angles. So I colored them out myself using some spare quarters that I had on hand but not playing.
But hmm, I've never seen the Taj's blues, though Archie Black has a photo
here. I'll have to see if I can spot the $40/80 there.
And now, I've officially contributed to the hijacking of this thread.