The patch notes never stated a limited time though. Someone said it was mentioned in a news letter, but I've never seen the link.
Do you have a link to where they stated the nightmare colors would be limited?...
Publish 118.1 Features! - Ultima Online Forums
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"For a limited time only!" is pretty vague. On purpose I would suspect.
Macy's has a "limited time" spring sale for bedding, every sping.
Starbuck's sells pumpkin spice latte's each fall for "a limited time".
McDonald's puts new items in their menu constantly "for a limited time" of about 6 months, then brings them back again a year or so later "for a limited time" of another 6 months.
"A limited time" is just marketing speak to drive consumer purchases.
Companies use it because it works.
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Anyone remember the original green soul stones? You know, the ones you got from pre-ordering Samurai Empire? The green soul stones the developers at the time guaranteed would never again be available in game; "You can only ever get them from pre-ordering Samurai Empire, get as many boxes as you can now!" Those same green soul stones we can now buy directly from the in-game store, in quantities as large as we desire. Those turned out to not be so rare after all, eh?
We'll see, but I'm guessing these nightmare colors are popular enough, and generating enough $$$ in totem sales, they will find their way back into the game at some point.